diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 941d8995c560..57fa8e42a374 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -137,6 +137,7 @@ jobs:
           IREE_USE_LOCAL_CCACHE: 1
           IREE_READ_REMOTE_CCACHE: 0
           CCACHE_DIR: ${{ github.workspace }}/.ccache
+          CCACHE_COMPRESSLEVEL: 5
         run: ./build_tools/cmake/build_all.sh "${BUILD_DIR}"
       - name: "Testing IREE"
         run: ./build_tools/cmake/ctest_all.sh "${BUILD_DIR}"
diff --git a/build_tools/cmake/build_all.sh b/build_tools/cmake/build_all.sh
index 689a63b3159f..cdd894bb3308 100755
--- a/build_tools/cmake/build_all.sh
+++ b/build_tools/cmake/build_all.sh
@@ -75,4 +75,5 @@ echo "------------------"
 
 if (( IREE_READ_REMOTE_CCACHE == 1 || IREE_USE_LOCAL_CCACHE == 1 )); then
   ccache --show-stats
+  ccache --show-compression  # DO NOT SUBMIT
 fi