diff --git a/hail/build.gradle b/hail/build.gradle
index 36e378998c4..bc8ca4c101c 100644
--- a/hail/build.gradle
+++ b/hail/build.gradle
@@ -204,7 +204,7 @@ dependencies {
 
     bundled 'com.kohlschutter.junixsocket:junixsocket-core:2.6.1'
 
-    bundled 'com.github.luben:zstd-jni:1.5.5-2'
+    bundled 'com.github.luben:zstd-jni:1.5.2-1'
 
     bundled project(path: ':shadedazure', configuration: 'shadow')
 }
diff --git a/hail/python/hail/matrixtable.py b/hail/python/hail/matrixtable.py
index 6baceae5d33..fd17c2a9b36 100644
--- a/hail/python/hail/matrixtable.py
+++ b/hail/python/hail/matrixtable.py
@@ -2662,6 +2662,22 @@ def checkpoint(self, output: str, overwrite: bool = False, stage_locally: bool =
         --------
         >>> dataset = dataset.checkpoint('output/dataset_checkpoint.mt')
         """
+        if _codec_spec is None:
+            _codec_spec = """{
+  "name": "LEB128BufferSpec",
+  "child": {
+    "name": "BlockingBufferSpec",
+    "blockSize": 32768,
+    "child": {
+      "name": "LZ4FastBlockBufferSpec",
+      "blockSize": 32768,
+      "child": {
+        "name": "StreamBlockBufferSpec"
+      }
+    }
+  }
+}"""
+
         hl.current_backend().validate_file_scheme(output)
 
         if not _read_if_exists or not hl.hadoop_exists(f'{output}/_SUCCESS'):
diff --git a/hail/python/hail/table.py b/hail/python/hail/table.py
index b778e38ab4f..9febea65b9f 100644
--- a/hail/python/hail/table.py
+++ b/hail/python/hail/table.py
@@ -1327,6 +1327,22 @@ def checkpoint(self, output: str, overwrite: bool = False, stage_locally: bool =
         """
         hl.current_backend().validate_file_scheme(output)
 
+        if _codec_spec is None:
+            _codec_spec = """{
+  "name": "LEB128BufferSpec",
+  "child": {
+    "name": "BlockingBufferSpec",
+    "blockSize": 32768,
+    "child": {
+      "name": "LZ4FastBlockBufferSpec",
+      "blockSize": 32768,
+      "child": {
+        "name": "StreamBlockBufferSpec"
+      }
+    }
+  }
+}"""
+
         if not _read_if_exists or not hl.hadoop_exists(f'{output}/_SUCCESS'):
             self.write(output=output, overwrite=overwrite, stage_locally=stage_locally, _codec_spec=_codec_spec)
             _assert_type = self._type
diff --git a/hail/python/hail/vds/combiner/variant_dataset_combiner.py b/hail/python/hail/vds/combiner/variant_dataset_combiner.py
index f47e465bfb3..02a1bcb4d4d 100644
--- a/hail/python/hail/vds/combiner/variant_dataset_combiner.py
+++ b/hail/python/hail/vds/combiner/variant_dataset_combiner.py
@@ -43,10 +43,10 @@ class CombinerOutType(NamedTuple):
   "name": "LEB128BufferSpec",
   "child": {
     "name": "BlockingBufferSpec",
-    "blockSize": 65536,
+    "blockSize": 32768,
     "child": {
-      "name": "ZstdBlockBufferSpec",
-      "blockSize": 65536,
+      "name": "LZ4FastBlockBufferSpec",
+      "blockSize": 32768,
       "child": {
         "name": "StreamBlockBufferSpec"
       }
diff --git a/hail/python/test/hail/backend/test_service_backend.py b/hail/python/test/hail/backend/test_service_backend.py
index 1a0e0fa50b5..12da7814688 100644
--- a/hail/python/test/hail/backend/test_service_backend.py
+++ b/hail/python/test/hail/backend/test_service_backend.py
@@ -9,9 +9,13 @@
 @skip_unless_service_backend()
 def test_tiny_driver_has_tiny_memory():
     try:
-        hl.eval(hl.range(1024 * 1024).map(lambda x: hl.range(1024 * 1024)))
-    except hl.utils.FatalError as exc:
-        assert "HailException: Hail off-heap memory exceeded maximum threshold: limit " in exc.args[0]
+        hl.utils.range_table(100_000_000, 50).to_pandas()
+    except Exception as exc:
+        # Sometimes the JVM properly OOMs, sometimes it just dies.
+        assert (
+            'java.lang.OutOfMemoryError: Java heap space' in exc.args[0] or
+            'batch.worker.jvm_entryway_protocol.EndOfStream' in exc.args[0]
+        )
     else:
         assert False
 
diff --git a/hail/python/test/hail/matrixtable/test_file_formats.py b/hail/python/test/hail/matrixtable/test_file_formats.py
index d4a098f72fe..5d158ae8a4b 100644
--- a/hail/python/test/hail/matrixtable/test_file_formats.py
+++ b/hail/python/test/hail/matrixtable/test_file_formats.py
@@ -73,7 +73,7 @@ def all_values_table_fixture(init_hail):
 
 @pytest.mark.parametrize("path", mt_paths)
 def test_backward_compatability_mt(path, all_values_matrix_table_fixture):
-    assert len(mt_paths) == 56, str((resource_dir, ht_paths))
+    assert len(mt_paths) == 46, str((resource_dir, ht_paths))
 
     old = hl.read_matrix_table(path)
 
@@ -88,7 +88,7 @@ def test_backward_compatability_mt(path, all_values_matrix_table_fixture):
 
 @pytest.mark.parametrize("path", ht_paths)
 def test_backward_compatability_ht(path, all_values_table_fixture):
-    assert len(ht_paths) == 52, str((resource_dir, ht_paths))
+    assert len(ht_paths) == 42, str((resource_dir, ht_paths))
 
     old = hl.read_table(path)
 
diff --git a/hail/src/main/scala/is/hail/expr/ir/AbstractMatrixTableSpec.scala b/hail/src/main/scala/is/hail/expr/ir/AbstractMatrixTableSpec.scala
index 0b23745d117..ff854ce4b06 100644
--- a/hail/src/main/scala/is/hail/expr/ir/AbstractMatrixTableSpec.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/AbstractMatrixTableSpec.scala
@@ -198,5 +198,5 @@ class MatrixTableSpec(
 }
 
 object FileFormat {
-  val version: SemanticVersion = SemanticVersion(1, 7, 0)
+  val version: SemanticVersion = SemanticVersion(1, 6, 0)
 }
diff --git a/hail/src/main/scala/is/hail/expr/ir/Emit.scala b/hail/src/main/scala/is/hail/expr/ir/Emit.scala
index 304d39343af..d45be5c44e9 100644
--- a/hail/src/main/scala/is/hail/expr/ir/Emit.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/Emit.scala
@@ -740,7 +740,7 @@ class Emit[C](
         val ns = sigs.length
         val deserializers = sc.states.states
           .slice(start, start + ns)
-          .map(sc => sc.deserialize(spec))
+          .map(sc => sc.deserialize(BufferSpec.defaultUncompressed))
 
         Array.range(start, start + ns).foreach(i => sc.newState(cb, i))
 
@@ -2374,7 +2374,7 @@ class Emit[C](
             PCanonicalTuple(true, et.emitType.storageType).constructFromFields(cb, region, FastIndexedSeq(et), deepCopy = false)
           }
 
-          val bufferSpec: BufferSpec = BufferSpec.blockedUncompressed
+          val bufferSpec: BufferSpec = BufferSpec.defaultUncompressed
 
           val emitGlobals = EmitCode.fromI(mb)(cb => emitInNewBuilder(cb, globals))
 
diff --git a/hail/src/main/scala/is/hail/expr/ir/EmitClassBuilder.scala b/hail/src/main/scala/is/hail/expr/ir/EmitClassBuilder.scala
index bbb8c5e9d34..3c8a58dc5c9 100644
--- a/hail/src/main/scala/is/hail/expr/ir/EmitClassBuilder.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/EmitClassBuilder.scala
@@ -333,7 +333,7 @@ class EmitClassBuilder[C](
   private[this] def encodeLiterals(): Array[AnyRef] = {
     val (literals, preEncodedLiterals) = emodb.literalsResult()
     val litType = PCanonicalTuple(true, literals.map(_._1.canonicalPType.setRequired(true)): _*)
-    val spec = TypedCodecSpec(litType, BufferSpec.wireSpec)
+    val spec = TypedCodecSpec(litType, BufferSpec.defaultUncompressed)
 
     cb.addInterface(typeInfo[FunctionWithLiterals].iname)
     val mb2 = newEmitMethod("addAndDecodeLiterals", FastIndexedSeq[ParamType](typeInfo[Array[AnyRef]]), typeInfo[Unit])
diff --git a/hail/src/main/scala/is/hail/expr/ir/IR.scala b/hail/src/main/scala/is/hail/expr/ir/IR.scala
index 0caae00a07f..0a33bec0672 100644
--- a/hail/src/main/scala/is/hail/expr/ir/IR.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/IR.scala
@@ -111,7 +111,7 @@ object EncodedLiteral {
       case ts: PString => Str(ts.loadString(addr))
       case _ =>
         val etype = EType.defaultFromPType(pt)
-        val codec = TypedCodecSpec(etype, pt.virtualType, BufferSpec.wireSpec)
+        val codec = TypedCodecSpec(etype, pt.virtualType, BufferSpec.defaultUncompressed)
         val bytes = codec.encodeArrays(ctx, pt, addr)
         EncodedLiteral(codec, bytes)
     }
diff --git a/hail/src/main/scala/is/hail/expr/ir/Interpret.scala b/hail/src/main/scala/is/hail/expr/ir/Interpret.scala
index bb90e50f064..fa7521c9e95 100644
--- a/hail/src/main/scala/is/hail/expr/ir/Interpret.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/Interpret.scala
@@ -897,7 +897,7 @@ object Interpret {
           // TODO Is this right? where does wrapped run?
           ctx.scopedExecution((hcl, fs, htc, r) => SafeRow(rt, f(hcl, fs, htc, r).apply(r, globalsOffset)))
         } else {
-          val spec = BufferSpec.blockedUncompressed
+          val spec = BufferSpec.defaultUncompressed
 
           val (_, initOp) = CompileWithAggregators[AsmFunction2RegionLongUnit](ctx,
             extracted.states,
diff --git a/hail/src/main/scala/is/hail/expr/ir/TableIR.scala b/hail/src/main/scala/is/hail/expr/ir/TableIR.scala
index 34bf23d0011..46c0ebac13e 100644
--- a/hail/src/main/scala/is/hail/expr/ir/TableIR.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/TableIR.scala
@@ -2562,7 +2562,7 @@ case class TableMapRows(child: TableIR, newRow: IR) extends TableIR {
       else
         null
 
-    val spec = BufferSpec.blockedUncompressed
+    val spec = BufferSpec.defaultUncompressed
 
     // Order of operations:
     // 1. init op on all aggs and serialize to byte array.
@@ -3059,7 +3059,7 @@ case class TableKeyByAndAggregate(
 
     val globalsBc = prev.globals.broadcast(ctx.theHailClassLoader)
 
-    val spec = BufferSpec.blockedUncompressed
+    val spec = BufferSpec.defaultUncompressed
     val res = genUID()
 
     val extracted = agg.Extract(expr, res, Requiredness(this, ctx))
diff --git a/hail/src/main/scala/is/hail/expr/ir/agg/AggregatorState.scala b/hail/src/main/scala/is/hail/expr/ir/agg/AggregatorState.scala
index 6873c365ec4..5c12541defe 100644
--- a/hail/src/main/scala/is/hail/expr/ir/agg/AggregatorState.scala
+++ b/hail/src/main/scala/is/hail/expr/ir/agg/AggregatorState.scala
@@ -39,7 +39,7 @@ trait AggregatorState {
     val lazyBuffer = kb.getOrDefineLazyField[MemoryBufferWrapper](Code.newInstance[MemoryBufferWrapper](), ("AggregatorStateBufferWrapper"))
     cb += lazyBuffer.invoke[Array[Byte], Unit]("set", bytes.loadBytes(cb))
     val ib = cb.memoize(lazyBuffer.invoke[InputBuffer]("buffer"))
-    deserialize(BufferSpec.blockedUncompressed)(cb, ib)
+    deserialize(BufferSpec.defaultUncompressed)(cb, ib)
     cb += lazyBuffer.invoke[Unit]("invalidate")
   }
 
@@ -48,7 +48,7 @@ trait AggregatorState {
     val addr = kb.genFieldThisRef[Long]("addr")
     cb += lazyBuffer.invoke[Unit]("clear")
     val ob = cb.memoize(lazyBuffer.invoke[OutputBuffer]("buffer"))
-    serialize(BufferSpec.blockedUncompressed)(cb, ob)
+    serialize(BufferSpec.defaultUncompressed)(cb, ob)
     cb.assign(addr, t.allocate(r, lazyBuffer.invoke[Int]("length")))
     t.storeLength(cb, addr, lazyBuffer.invoke[Int]("length"))
     cb += lazyBuffer.invoke[Long, Unit]("copyToAddress", t.bytesAddress(addr))
diff --git a/hail/src/main/scala/is/hail/io/BufferSpecs.scala b/hail/src/main/scala/is/hail/io/BufferSpecs.scala
index 2ca8876fc89..b98fca3aa4a 100644
--- a/hail/src/main/scala/is/hail/io/BufferSpecs.scala
+++ b/hail/src/main/scala/is/hail/io/BufferSpecs.scala
@@ -12,30 +12,24 @@ import org.json4s.jackson.JsonMethods
 import org.json4s.{Extraction, JValue}
 
 object BufferSpec {
-  val zstdCompressionLEB: BufferSpec = LEB128BufferSpec(
-    BlockingBufferSpec(64 * 1024,
-      ZstdBlockBufferSpec(64 * 1024,
+  val default: BufferSpec = LEB128BufferSpec(
+    BlockingBufferSpec(32 * 1024,
+      LZ4HCBlockBufferSpec(32 * 1024,
         new StreamBlockBufferSpec)))
 
-  val default: BufferSpec = zstdCompressionLEB
-
-  val blockedUncompressed: BufferSpec = BlockingBufferSpec(32 * 1024,
+  val defaultUncompressed: BufferSpec = BlockingBufferSpec(32 * 1024,
     new StreamBlockBufferSpec)
+
   val unblockedUncompressed: BufferSpec = new StreamBufferSpec
 
   val wireSpec: BufferSpec = LEB128BufferSpec(
-    BlockingBufferSpec(64 * 1024,
-      ZstdSizedBasedBlockBufferSpec(64 * 1024,
-        /*minCompressionSize=*/256,
-        new StreamBlockBufferSpec)))
-  val memorySpec: BufferSpec = wireSpec
-
-  // longtime default spec
-  val lz4HCCompressionLEB: BufferSpec = LEB128BufferSpec(
     BlockingBufferSpec(32 * 1024,
-      LZ4HCBlockBufferSpec(32 * 1024,
+      LZ4SizeBasedBlockBufferSpec("fast", 32 * 1024,
+        256,
         new StreamBlockBufferSpec)))
 
+  val memorySpec: BufferSpec = wireSpec
+
   val blockSpecs: Array[BufferSpec] = Array(
     BlockingBufferSpec(64 * 1024,
       new StreamBlockBufferSpec),
@@ -45,9 +39,6 @@ object BufferSpec {
     BlockingBufferSpec(32 * 1024,
       LZ4FastBlockBufferSpec(32 * 1024,
         new StreamBlockBufferSpec)),
-    BlockingBufferSpec(64 * 1024,
-      ZstdBlockBufferSpec(64 * 1024,
-        new StreamBlockBufferSpec)),
     new StreamBufferSpec)
 
   val specs: Array[BufferSpec] = blockSpecs.flatMap { blockSpec =>
@@ -70,7 +61,6 @@ object BufferSpec {
       classOf[LZ4HCBlockBufferSpec],
       classOf[LZ4FastBlockBufferSpec],
       classOf[LZ4SizeBasedBlockBufferSpec],
-      classOf[ZstdBlockBufferSpec],
       classOf[StreamBlockBufferSpec],
       classOf[BufferSpec],
       classOf[LEB128BufferSpec],
@@ -184,34 +174,6 @@ final case class LZ4SizeBasedBlockBufferSpec(compressorType: String, blockSize:
     Code.newInstance[LZ4SizeBasedCompressingOutputBlockBuffer, LZ4, Int, Int, OutputBlockBuffer](stagedlz4, blockSize, minCompressionSize, child.buildCodeOutputBuffer(out))
 }
 
-final case class ZstdBlockBufferSpec(blockSize: Int, child: BlockBufferSpec) extends BlockBufferSpec {
-  require(blockSize <= (1 << 16))
-
-  def buildInputBuffer(in: InputStream): InputBlockBuffer = new ZstdInputBlockBuffer(blockSize, child.buildInputBuffer(in))
-
-  def buildOutputBuffer(out: OutputStream): OutputBlockBuffer = new ZstdOutputBlockBuffer(blockSize, child.buildOutputBuffer(out))
-
-  def buildCodeInputBuffer(in: Code[InputStream]): Code[InputBlockBuffer] =
-    Code.newInstance[ZstdInputBlockBuffer, Int, InputBlockBuffer](blockSize, child.buildCodeInputBuffer(in))
-
-  def buildCodeOutputBuffer(out: Code[OutputStream]): Code[OutputBlockBuffer] =
-    Code.newInstance[ZstdOutputBlockBuffer, Int, OutputBlockBuffer](blockSize, child.buildCodeOutputBuffer(out))
-}
-
-final case class ZstdSizedBasedBlockBufferSpec(blockSize: Int, minCompressionSize: Int, child: BlockBufferSpec) extends BlockBufferSpec {
-  require(blockSize <= (1 << 16))
-
-  def buildInputBuffer(in: InputStream): InputBlockBuffer = new ZstdSizedBasedInputBlockBuffer(blockSize, child.buildInputBuffer(in))
-
-  def buildOutputBuffer(out: OutputStream): OutputBlockBuffer = new ZstdSizedBasedOutputBlockBuffer(blockSize, minCompressionSize, child.buildOutputBuffer(out))
-
-  def buildCodeInputBuffer(in: Code[InputStream]): Code[InputBlockBuffer] =
-    Code.newInstance[ZstdSizedBasedInputBlockBuffer, Int, InputBlockBuffer](blockSize, child.buildCodeInputBuffer(in))
-
-  def buildCodeOutputBuffer(out: Code[OutputStream]): Code[OutputBlockBuffer] =
-    Code.newInstance[ZstdSizedBasedOutputBlockBuffer, Int, Int, OutputBlockBuffer](blockSize, minCompressionSize, child.buildCodeOutputBuffer(out))
-}
-
 object StreamBlockBufferSpec {
   def extract(jv: JValue): StreamBlockBufferSpec = new StreamBlockBufferSpec
 }
diff --git a/hail/src/main/scala/is/hail/io/InputBuffers.scala b/hail/src/main/scala/is/hail/io/InputBuffers.scala
index dd22a159112..60a899d850d 100644
--- a/hail/src/main/scala/is/hail/io/InputBuffers.scala
+++ b/hail/src/main/scala/is/hail/io/InputBuffers.scala
@@ -8,8 +8,6 @@ import is.hail.annotations.{Memory, Region}
 import is.hail.io.compress.LZ4
 import is.hail.utils._
 
-import com.github.luben.zstd.Zstd
-
 trait InputBuffer extends Closeable {
   def close(): Unit
 
@@ -629,57 +627,3 @@ final class LZ4SizeBasedCompressingInputBlockBuffer(lz4: LZ4, blockSize: Int, in
     result
   }
 }
-
-final class ZstdInputBlockBuffer(blockSize: Int, in: InputBlockBuffer) extends InputBlockBuffer {
-  private val comp = new Array[Byte](4 + Zstd.compressBound(blockSize).toInt)
-
-  def close(): Unit = {
-    in.close()
-  }
-
-  def seek(offset: Long): Unit = in.seek(offset)
-
-  def readBlock(buf: Array[Byte]): Int = {
-    val blockLen = in.readBlock(comp)
-    if (blockLen == -1) {
-      blockLen
-    } else {
-      val compLen = blockLen - 4
-      val decompLen = Memory.loadInt(comp, 0)
-      val ret = Zstd.decompressByteArray(buf, 0, decompLen, comp, 4, compLen)
-      if (Zstd.isError(ret))
-        throw new com.github.luben.zstd.ZstdException(ret)
-      decompLen
-    }
-  }
-}
-
-final class ZstdSizedBasedInputBlockBuffer(blockSize: Int, in: InputBlockBuffer) extends InputBlockBuffer {
-  private val comp = new Array[Byte](4 + Zstd.compressBound(blockSize).toInt)
-
-  def close(): Unit = {
-    in.close()
-  }
-
-  def seek(offset: Long): Unit = in.seek(offset)
-
-  def readBlock(buf: Array[Byte]): Int = {
-    val blockLen = in.readBlock(comp)
-    if (blockLen == -1) {
-      blockLen
-    } else {
-      val compLen = blockLen - 4
-      val decomp = Memory.loadInt(comp, 0)
-      if (decomp % 2 == 0) {
-        System.arraycopy(comp, 4, buf, 0, compLen)
-        compLen
-      } else {
-        val decompLen = decomp >>> 1
-        val ret = Zstd.decompressByteArray(buf, 0, decompLen, comp, 4, compLen)
-        if (Zstd.isError(ret))
-          throw new com.github.luben.zstd.ZstdException(ret)
-        decompLen
-      }
-    }
-  }
-}
diff --git a/hail/src/main/scala/is/hail/io/OutputBuffers.scala b/hail/src/main/scala/is/hail/io/OutputBuffers.scala
index cc942ccb871..065665c5a03 100644
--- a/hail/src/main/scala/is/hail/io/OutputBuffers.scala
+++ b/hail/src/main/scala/is/hail/io/OutputBuffers.scala
@@ -8,8 +8,6 @@ import is.hail.io.compress.LZ4
 import is.hail.utils._
 import is.hail.utils.richUtils.ByteTrackingOutputStream
 
-import com.github.luben.zstd.Zstd
-
 trait OutputBuffer extends Closeable {
   def flush(): Unit
 
@@ -343,48 +341,4 @@ final class LZ4SizeBasedCompressingOutputBlockBuffer(lz4: LZ4, blockSize: Int, m
   }
 
   def getPos(): Long = out.getPos()
-}
-
-final class ZstdOutputBlockBuffer(blockSize: Int, out: OutputBlockBuffer) extends OutputBlockBuffer {
-  private val comp = new Array[Byte](4 + Zstd.compressBound(blockSize).toInt)
-
-  def flush(): Unit = out.flush()
-
-  def close(): Unit = out.close()
-
-  def writeBlock(buf: Array[Byte], decompLen: Int): Unit = {
-    val compLen = Zstd.compressByteArray(comp, 4, comp.length - 4, buf, 0, decompLen, Zstd.defaultCompressionLevel())
-    if (Zstd.isError(compLen))
-      throw new com.github.luben.zstd.ZstdException(compLen)
-    Memory.storeInt(comp, 0, decompLen.toInt)
-    out.writeBlock(comp, compLen.toInt + 4)
-  }
-
-  def getPos(): Long = out.getPos()
-}
-
-final class ZstdSizedBasedOutputBlockBuffer(blockSize: Int, minCompressionSize: Int, out: OutputBlockBuffer) extends OutputBlockBuffer {
-  private val comp = new Array[Byte](4 + Zstd.compressBound(blockSize).toInt)
-
-  def flush(): Unit = out.flush()
-
-  def close(): Unit = out.close()
-
-  def writeBlock(buf: Array[Byte], decompLen: Int): Unit = {
-    val compLen = if (decompLen < minCompressionSize) {
-      System.arraycopy(buf, 0, comp, 4, decompLen)
-      Memory.storeInt(comp, 0, 0)
-      decompLen
-    } else {
-      val compLen = Zstd.compressByteArray(comp, 4, comp.length - 4, buf, 0, decompLen, Zstd.defaultCompressionLevel())
-      if (Zstd.isError(compLen))
-        throw new com.github.luben.zstd.ZstdException(compLen)
-      Memory.storeInt(comp, 0, (decompLen << 1) + 1)
-      compLen.toInt
-    }
-
-    out.writeBlock(comp, compLen + 4)
-  }
-
-  def getPos(): Long = out.getPos()
-}
+}
\ No newline at end of file
diff --git a/hail/src/main/scala/is/hail/io/bgen/BgenRDDPartitions.scala b/hail/src/main/scala/is/hail/io/bgen/BgenRDDPartitions.scala
index 514af6b9e12..4365bf64d4f 100644
--- a/hail/src/main/scala/is/hail/io/bgen/BgenRDDPartitions.scala
+++ b/hail/src/main/scala/is/hail/io/bgen/BgenRDDPartitions.scala
@@ -84,7 +84,7 @@ object BgenRDDPartitions extends Logging {
 
     val nonEmptyFilesAfterFilter = sortedFiles.filter(_.nVariants > 0)
 
-    val (leafSpec, intSpec) = BgenSettings.indexCodecSpecs(files.head.indexVersion, rg)
+    val (leafSpec, intSpec) = BgenSettings.indexCodecSpecs(rg)
     val getKeysFromFile = StagedBGENReader.queryIndexByPosition(ctx, leafSpec, intSpec)
 
     nonEmptyFilesAfterFilter.zipWithIndex.map { case (file, fileIndex) =>
diff --git a/hail/src/main/scala/is/hail/io/bgen/BgenSettings.scala b/hail/src/main/scala/is/hail/io/bgen/BgenSettings.scala
index e833a06365e..b433837e172 100644
--- a/hail/src/main/scala/is/hail/io/bgen/BgenSettings.scala
+++ b/hail/src/main/scala/is/hail/io/bgen/BgenSettings.scala
@@ -7,7 +7,7 @@ import is.hail.types.encoded._
 import is.hail.types.physical._
 import is.hail.types.virtual._
 import is.hail.types.{MatrixType, TableType}
-import is.hail.utils._
+import is.hail.utils.FastIndexedSeq
 import is.hail.variant.ReferenceGenome
 
 
@@ -22,16 +22,11 @@ object BgenSettings {
 
   val indexAnnotationType: Type = TStruct.empty
 
-  private def specFromVersion(indexVersion: SemanticVersion): BufferSpec =
-    if (indexVersion >= SemanticVersion(1, 2, 0)) {
-      BufferSpec.zstdCompressionLEB
-    } else {
-      BufferSpec.lz4HCCompressionLEB
-    }
-
-
-  def indexCodecSpecs(indexVersion: SemanticVersion, rg: Option[String]): (AbstractTypedCodecSpec, AbstractTypedCodecSpec) = {
-    val bufferSpec = specFromVersion(indexVersion)
+  def indexCodecSpecs(rg: Option[String]): (AbstractTypedCodecSpec, AbstractTypedCodecSpec) = {
+    val bufferSpec = LEB128BufferSpec(
+      BlockingBufferSpec(32 * 1024,
+        LZ4HCBlockBufferSpec(32 * 1024,
+          new StreamBlockBufferSpec)))
 
     val keyVType = indexKeyType(rg)
     val keyEType = EBaseStruct(FastIndexedSeq(
diff --git a/hail/src/main/scala/is/hail/io/bgen/LoadBgen.scala b/hail/src/main/scala/is/hail/io/bgen/LoadBgen.scala
index dc7e4dba05c..994a34fe1d5 100644
--- a/hail/src/main/scala/is/hail/io/bgen/LoadBgen.scala
+++ b/hail/src/main/scala/is/hail/io/bgen/LoadBgen.scala
@@ -39,7 +39,6 @@ case class BgenHeader(
 
 case class BgenFileMetadata(
   indexPath: String,
-  indexVersion: SemanticVersion,
   header: BgenHeader,
   rg: Option[String],
   contigRecoding: Map[String, String],
@@ -196,8 +195,7 @@ object LoadBgen {
         case _ => None
       }
       val metadata = IndexReader.readMetadata(fs, indexFile, keyType, annotationType)
-      val indexVersion = SemanticVersion(metadata.fileVersion)
-      val (leafSpec, internalSpec) = BgenSettings.indexCodecSpecs(indexVersion, rg)
+      val (leafSpec, internalSpec) = BgenSettings.indexCodecSpecs(rg)
 
       val getKeys = cacheByRG.getOrElseUpdate(rg, StagedBGENReader.queryIndexByPosition(ctx, leafSpec, internalSpec))
 
@@ -213,7 +211,6 @@ object LoadBgen {
 
       BgenFileMetadata(
         indexFile,
-        indexVersion,
         h,
         rg,
         contigRecoding,
@@ -343,9 +340,6 @@ object MatrixBGENReader {
     val indexFiles = LoadBgen.getIndexFiles(fs, allFiles, params.indexFileMap)
     val fileMetadata = LoadBgen.getBgenFileMetadata(ctx, allFiles, indexFiles)
     assert(fileMetadata.nonEmpty)
-    if (fileMetadata.exists(md => md.indexVersion != fileMetadata.head.indexVersion)) {
-      fatal("BGEN index version mismatch. The index versions of all files must be the same, use 'index_bgen' to reindex all files to ensure that all index versions match before calling 'import_bgen' again")
-    }
 
     val sampleIds = params.sampleFile.map(file => LoadBgen.readSampleFile(fs, file))
       .getOrElse(LoadBgen.readSamples(fs, fileMetadata.head.path))
@@ -613,7 +607,7 @@ case class BgenPartitionReaderWithVariantFilter(fileMetadata: Array[BgenFileMeta
     val contigRecoding = mb.genFieldThisRef[Map[String, String]]("bgen_contig_recoding")
 
     val indexNKeys = mb.genFieldThisRef[Long]("index_nkeys")
-    val (leafCodec, intCodec) = BgenSettings.indexCodecSpecs(fileMetadata.head.indexVersion, rg)
+    val (leafCodec, intCodec) = BgenSettings.indexCodecSpecs(rg)
     val index = new StagedIndexReader(mb, leafCodec, intCodec)
 
     val currVariantIndex = mb.genFieldThisRef[Long]("currVariantIndex")
@@ -751,7 +745,7 @@ case class BgenPartitionReader(fileMetadata: Array[BgenFileMetadata], rg: Option
 
     val currVariantIndex = mb.genFieldThisRef[Long]("bgen_currIdx")
     val endVariantIndex = mb.genFieldThisRef[Long]("bgen_endIdx")
-    val (leafCodec, intCodec) = BgenSettings.indexCodecSpecs(fileMetadata.head.indexVersion, rg)
+    val (leafCodec, intCodec) = BgenSettings.indexCodecSpecs(rg)
     val index = new StagedIndexReader(mb, leafCodec, intCodec)
 
     var out: EmitSettable = null // filled in later
@@ -827,4 +821,4 @@ case class BgenPartitionReader(fileMetadata: Array[BgenFileMetadata], rg: Option
   }
 
   def toJValue: JValue = Extraction.decompose(this)(PartitionReader.formats)
-}
+}
\ No newline at end of file
diff --git a/hail/src/main/scala/is/hail/io/index/IndexWriter.scala b/hail/src/main/scala/is/hail/io/index/IndexWriter.scala
index f89ddb44517..be777688fe0 100644
--- a/hail/src/main/scala/is/hail/io/index/IndexWriter.scala
+++ b/hail/src/main/scala/is/hail/io/index/IndexWriter.scala
@@ -73,7 +73,7 @@ case class IndexMetadata(
 ) extends AbstractIndexMetadata
 
 object IndexWriter {
-  val version: SemanticVersion = SemanticVersion(1, 2, 0)
+  val version: SemanticVersion = SemanticVersion(1, 1, 0)
 
   val spec: BufferSpec = BufferSpec.default
   def builder(
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/README.txt
deleted file mode 100644
index 27ac7850704..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:11
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/_SUCCESS
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/README.txt
deleted file mode 100644
index 27ac7850704..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:11
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/_SUCCESS
deleted file mode 100644
index e69de29bb2d..00000000000
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deleted file mode 100644
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/rows/parts/part-0 b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/cols/rows/parts/part-0
deleted file mode 100644
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/README.txt
deleted file mode 100644
index 27ac7850704..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:11
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/_SUCCESS
deleted file mode 100644
index e69de29bb2d..00000000000
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/rows/parts/part-1-6a7fbc1c-d3ca-4cac-9836-692a6ce1e38d b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/entries/rows/parts/part-1-6a7fbc1c-d3ca-4cac-9836-692a6ce1e38d
deleted file mode 100644
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/globals/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/globals/README.txt
deleted file mode 100644
index 27ac7850704..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/globals/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:11
\ No newline at end of file
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/metadata.json.gz b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/metadata.json.gz
deleted file mode 100644
index acaa78da17e..00000000000
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/rows/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/rows/README.txt
deleted file mode 100644
index 27ac7850704..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/rows/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:11
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/rows/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/0.hmt/rows/_SUCCESS
deleted file mode 100644
index e69de29bb2d..00000000000
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/README.txt
deleted file mode 100644
index 0b45111a122..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:13
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/_SUCCESS
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/cols/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/cols/README.txt
deleted file mode 100644
index 0b45111a122..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/cols/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:13
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/cols/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/matrix_table/1.hmt/cols/_SUCCESS
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:16
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:19
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:19
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-  Written with version 0.2.115-cdba2731749a
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:19
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:21
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-  Written with version 0.2.115-cdba2731749a
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:25
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:25
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-  Written with version 0.2.115-cdba2731749a
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:32
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-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:08
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:12
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:15
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:17
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:20
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:22
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:24
\ No newline at end of file
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-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:26
\ No newline at end of file
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/table/8.ht/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/table/8.ht/README.txt
deleted file mode 100644
index 223b6c48604..00000000000
--- a/hail/src/test/resources/backward_compatability/1.7.0/table/8.ht/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:28
\ No newline at end of file
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diff --git a/hail/src/test/resources/backward_compatability/1.7.0/table/9.ht/README.txt b/hail/src/test/resources/backward_compatability/1.7.0/table/9.ht/README.txt
deleted file mode 100644
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--- a/hail/src/test/resources/backward_compatability/1.7.0/table/9.ht/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-This folder comprises a Hail (www.hail.is) native Table or MatrixTable.
-  Written with version 0.2.115-cdba2731749a
-  Created at 2023/05/08 11:07:31
\ No newline at end of file
diff --git a/hail/src/test/resources/backward_compatability/1.7.0/table/9.ht/_SUCCESS b/hail/src/test/resources/backward_compatability/1.7.0/table/9.ht/_SUCCESS
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diff --git a/hail/src/test/scala/is/hail/expr/ir/Aggregators2Suite.scala b/hail/src/test/scala/is/hail/expr/ir/Aggregators2Suite.scala
index a5638983080..3f107b33217 100644
--- a/hail/src/test/scala/is/hail/expr/ir/Aggregators2Suite.scala
+++ b/hail/src/test/scala/is/hail/expr/ir/Aggregators2Suite.scala
@@ -33,7 +33,7 @@ class Aggregators2Suite extends HailSuite {
     val argT = PType.canonical(TStruct(args.map { case (n, (typ, _)) => n -> typ }: _*)).setRequired(true).asInstanceOf[PStruct]
     val argVs = Row.fromSeq(args.map { case (_, (_, v)) => v })
     val argRef = Ref(genUID(), argT.virtualType)
-    val spec = BufferSpec.wireSpec
+    val spec = BufferSpec.defaultUncompressed
 
     val (_, combAndDuplicate) = CompileWithAggregators[AsmFunction1RegionUnit](ctx,
       Array.fill(nPartitions)(aggSig.state),
diff --git a/hail/src/test/scala/is/hail/expr/ir/IRSuite.scala b/hail/src/test/scala/is/hail/expr/ir/IRSuite.scala
index b5b2de2250b..989a075917f 100644
--- a/hail/src/test/scala/is/hail/expr/ir/IRSuite.scala
+++ b/hail/src/test/scala/is/hail/expr/ir/IRSuite.scala
@@ -3411,7 +3411,7 @@ class IRSuite extends HailSuite {
   def testReadWriteValues(pt: SingleCodeType, value: Any): Unit = {
     implicit val execStrats = ExecStrategy.compileOnly
     val node = In(0, SingleCodeEmitParamType(true, pt))
-    val spec = TypedCodecSpec(PType.canonical(node.typ), BufferSpec.blockedUncompressed)
+    val spec = TypedCodecSpec(PType.canonical(node.typ), BufferSpec.defaultUncompressed)
     val writer = ETypeValueWriter(spec)
     val reader = ETypeValueReader(spec)
     val prefix = ctx.createTmpPath("test-read-write-values")
@@ -3425,7 +3425,7 @@ class IRSuite extends HailSuite {
   def testReadWriteValueDistributed(pt: SingleCodeType, value: Any): Unit = {
     implicit val execStrats = ExecStrategy.compileOnly
     val node = In(0, SingleCodeEmitParamType(true, pt))
-    val spec = TypedCodecSpec(PType.canonical(node.typ), BufferSpec.blockedUncompressed)
+    val spec = TypedCodecSpec(PType.canonical(node.typ), BufferSpec.defaultUncompressed)
     val writer = ETypeValueWriter(spec)
     val reader = ETypeValueReader(spec)
     val prefix = ctx.createTmpPath("test-read-write-value-dist")