diff --git a/src/MicroOcpp/Core/ConfigurationContainerFlash.cpp b/src/MicroOcpp/Core/ConfigurationContainerFlash.cpp
index 204765de..d690d630 100644
--- a/src/MicroOcpp/Core/ConfigurationContainerFlash.cpp
+++ b/src/MicroOcpp/Core/ConfigurationContainerFlash.cpp
@@ -75,7 +75,7 @@ class ConfigurationContainerFlash : public ConfigurationContainer, public AllocO
             return save();
         }
 
-        auto doc = FilesystemUtils::loadJson(filesystem, getFilename());
+        auto doc = FilesystemUtils::loadJson(filesystem, getFilename(), getMemoryTag());
         if (!doc) {
             MO_DBG_ERR("failed to load %s", getFilename());
             return false;
@@ -130,7 +130,14 @@ class ConfigurationContainerFlash : public ConfigurationContainer, public AllocO
                 config = nullptr;
             }
             if (!config) {
-                key_pooled = static_cast<char*>(MO_MALLOC(key, strlen(key) + 1));
+                #if MO_ENABLE_HEAP_PROFILER
+                char memoryTag [64];
+                snprintf(memoryTag, sizeof(memoryTag), "%s%s", "v16.Configuration.", key);
+                #else
+                const char *memoryTag = nullptr;
+                (void)memoryTag;
+                #endif
+                key_pooled = static_cast<char*>(MO_MALLOC(memoryTag, strlen(key) + 1));
                 if (!key_pooled) {
                     MO_DBG_ERR("OOM: %s", key);
                     return false;
diff --git a/src/MicroOcpp/Core/FilesystemUtils.cpp b/src/MicroOcpp/Core/FilesystemUtils.cpp
index 77748e2e..f18b5643 100644
--- a/src/MicroOcpp/Core/FilesystemUtils.cpp
+++ b/src/MicroOcpp/Core/FilesystemUtils.cpp
@@ -9,7 +9,7 @@
 
 using namespace MicroOcpp;
 
-std::unique_ptr<MemJsonDoc> FilesystemUtils::loadJson(std::shared_ptr<FilesystemAdapter> filesystem, const char *fn) {
+std::unique_ptr<MemJsonDoc> FilesystemUtils::loadJson(std::shared_ptr<FilesystemAdapter> filesystem, const char *fn, const char *memoryTag) {
     if (!filesystem || !fn || *fn == '\0') {
         MO_DBG_ERR("Format error");
         return nullptr;
@@ -56,7 +56,7 @@ std::unique_ptr<MemJsonDoc> FilesystemUtils::loadJson(std::shared_ptr<Filesystem
 
     while (err == DeserializationError::NoMemory && capacity <= MO_MAX_JSON_CAPACITY) {
 
-        doc = makeMemJsonDoc(capacity, fn);
+        doc = makeMemJsonDoc(capacity, memoryTag);
         err = deserializeJson(*doc, fileReader);
 
         capacity *= 2;
diff --git a/src/MicroOcpp/Core/FilesystemUtils.h b/src/MicroOcpp/Core/FilesystemUtils.h
index 399250e9..6896e247 100644
--- a/src/MicroOcpp/Core/FilesystemUtils.h
+++ b/src/MicroOcpp/Core/FilesystemUtils.h
@@ -37,7 +37,7 @@ class ArduinoJsonFileAdapter {
 
 namespace FilesystemUtils {
 
-std::unique_ptr<MemJsonDoc> loadJson(std::shared_ptr<FilesystemAdapter> filesystem, const char *fn);
+std::unique_ptr<MemJsonDoc> loadJson(std::shared_ptr<FilesystemAdapter> filesystem, const char *fn, const char *memoryTag = nullptr);
 bool storeJson(std::shared_ptr<FilesystemAdapter> filesystem, const char *fn, const MemJsonDoc& doc);
 
 bool remove_if(std::shared_ptr<FilesystemAdapter> filesystem, std::function<bool(const char*)> pred);
diff --git a/src/MicroOcpp/Core/Memory.cpp b/src/MicroOcpp/Core/Memory.cpp
index 5386268f..adf8066c 100644
--- a/src/MicroOcpp/Core/Memory.cpp
+++ b/src/MicroOcpp/Core/Memory.cpp
@@ -18,47 +18,104 @@ struct MemBlockInfo {
         updateTag(ptr, tag);
     }
 
-    void updateTag(void* ptr, const char *tag) {
-        if (!tag) {
-            return;
-        }
-        if (tagger_ptr == nullptr || ptr < tagger_ptr) {
-            MO_DBG_DEBUG("update tag from %s to %s, ptr from %p to %p", this->tag.c_str(), tag, tagger_ptr, ptr);
-            tagger_ptr = ptr;
-            this->tag = tag;
+    void updateTag(void* ptr, const char *tag);
+};
+
+std::map<void*,MemBlockInfo> memBlocks; //key: memory address of malloc'd block
+
+struct MemTagInfo {
+    size_t current_size = 0;
+    size_t max_size = 0;
+
+    MemTagInfo(size_t size) {
+        operator+=(size);
+    }
+
+    void operator+=(size_t size) {
+        current_size += size;
+        max_size = std::max(max_size, current_size);
+    }
+
+    void operator-=(size_t size) {
+        if (size > current_size) {
+            MO_DBG_ERR("captured size does not fit");
+            //return; let it happen for now
         }
+        current_size -= size;
     }
 };
 
-std::map<void*,MemBlockInfo> memBlocks; //key: memory address of malloc'd block
+std::map<std::string,MemTagInfo> memTags;
+
+size_t memTotal, memTotalMax;
+
+void MemBlockInfo::updateTag(void* ptr, const char *tag) {
+    if (!tag) {
+        return;
+    }
+    if (tagger_ptr == nullptr || ptr < tagger_ptr) {
+        MO_DBG_VERBOSE("update tag from %s to %s, ptr from %p to %p", this->tag.c_str(), tag, tagger_ptr, ptr);
+
+        auto tagInfo = memTags.find(this->tag);
+        if (tagInfo != memTags.end()) {
+            tagInfo->second -= size;
+        }
+
+        tagInfo = memTags.find(tag);
+        if (tagInfo != memTags.end()) {
+            tagInfo->second += size;
+        } else {
+            memTags.emplace(tag, size);
+        }
+
+        tagger_ptr = ptr;
+        this->tag = tag;
+    }
+}
 
 #endif //MO_ENABLE_HEAP_PROFILER
 
 void mo_mem_deinit() {
     #if MO_ENABLE_HEAP_PROFILER
     memBlocks.clear();
+    memTags.clear();
     #endif
 }
 
 void *mo_mem_malloc(const char *tag, size_t size) {
-    MO_DBG_DEBUG("malloc %zu B (%s)", size, tag ? tag : "unspecified");
+    MO_DBG_VERBOSE("malloc %zu B (%s)", size, tag ? tag : "unspecified");
 
     auto ptr = malloc(size);
 
     #if MO_ENABLE_HEAP_PROFILER
     if (ptr) {
         memBlocks.emplace(ptr, MemBlockInfo(ptr, tag, size));
+
+        memTotal += size;
+        memTotalMax = std::max(memTotalMax, memTotal);
     }
     #endif
     return ptr;
 }
 
 void mo_mem_free(void* ptr) {
-    MO_DBG_DEBUG("free");
+    MO_DBG_VERBOSE("free");
 
     #if MO_ENABLE_HEAP_PROFILER
     if (ptr) {
-        memBlocks.erase(ptr);
+
+        auto blockInfo = memBlocks.find(ptr);
+        if (blockInfo != memBlocks.end()) {
+            auto tagInfo = memTags.find(blockInfo->second.tag);
+            if (tagInfo != memTags.end()) {
+                tagInfo->second -= blockInfo->second.size;
+            }
+            memTotal -= blockInfo->second.size;
+        }
+
+        if (blockInfo != memBlocks.end()) {
+            memBlocks.erase(blockInfo);
+        }
     }
     #endif
     free(ptr);
@@ -67,7 +124,7 @@ void mo_mem_free(void* ptr) {
 #if MO_ENABLE_HEAP_PROFILER
 
 void mo_mem_set_tag(void *ptr, const char *tag) {
-    MO_DBG_DEBUG("set tag (%s)", tag ? tag : "unspecified");
+    MO_DBG_VERBOSE("set tag (%s)", tag ? tag : "unspecified");
 
     if (!tag) {
         return;
@@ -88,7 +145,7 @@ void mo_mem_set_tag(void *ptr, const char *tag) {
     }
 
     if (!hasTagged) {
-        MO_DBG_DEBUG("memory area doesn't apply");
+        MO_DBG_VERBOSE("memory area doesn't apply");
     }
 }
 
@@ -127,7 +184,13 @@ void mo_mem_print_stats() {
         printf("%s - %zu B\n", tag.first.c_str(), tag.second);
     }
 
-    printf("Blocks: %zu\nTotal usage: %zu B\nTags: %zu\nTotal tagged: %zu B\nUntagged: %zu\nTotal untagged: %zu B\n", memBlocks.size(), size, tags.size(), size_control, untagged, untagged_size);
+    size_t size_control2 = 0;
+    for (const auto& tag : memTags) {
+        size_control2 += tag.second.current_size;
+        printf("%s - %zu B (max. %zu B)\n", tag.first.c_str(), tag.second.current_size, tag.second.max_size);
+    }
+
+    printf("Blocks: %zu\nTotal usage: %zu B\nTags: %zu\nTotal tagged: %zu B\nTags2: %zu\nTotal tagged2: %zu B\nUntagged: %zu\nTotal untagged: %zu B\nCurrent usage: %zu B\nMaximum usage: %zu B\n", memBlocks.size(), size, tags.size(), size_control, memTags.size(), size_control2, untagged, untagged_size, memTotal, memTotalMax);
 }
 
 #endif //MO_ENABLE_HEAP_PROFILER
diff --git a/src/MicroOcpp/Core/Memory.h b/src/MicroOcpp/Core/Memory.h
index e57ce218..932779a3 100644
--- a/src/MicroOcpp/Core/Memory.h
+++ b/src/MicroOcpp/Core/Memory.h
@@ -140,11 +140,11 @@ class AllocOverrider {
     }
 public:
     void *operator new(size_t size) {
-        MO_DBG_DEBUG("AllocOverrider new %zu B", size);
+        MO_DBG_VERBOSE("AllocOverrider new %zu B", size);
         return MO_MALLOC(nullptr, size);
     }
     void operator delete(void * ptr) {
-        MO_DBG_DEBUG("AllocOverrider delete");
+        MO_DBG_VERBOSE("AllocOverrider delete");
         MO_FREE(ptr);
     }
 
@@ -206,7 +206,7 @@ struct Allocator {
     }
 
     T *allocate(size_t count) {
-        MO_DBG_DEBUG("Allocator allocate %zu B (%s)", sizeof(T) * count, tag ? tag : "unspecified");
+        MO_DBG_VERBOSE("Allocator allocate %zu B (%s)", sizeof(T) * count, tag ? tag : "unspecified");
         return static_cast<T*>(
             MO_MALLOC(
                 #if MO_ENABLE_HEAP_PROFILER
@@ -217,7 +217,7 @@ struct Allocator {
                 sizeof(T) * count));
     }
     void deallocate(T *ptr, size_t count) {
-        MO_DBG_DEBUG("Allocator deallocate %zu B (%s)", sizeof(T) * count, tag ? tag : "unspecified");
+        MO_DBG_VERBOSE("Allocator deallocate %zu B (%s)", sizeof(T) * count, tag ? tag : "unspecified");
         MO_FREE(ptr);
     }
 
@@ -342,7 +342,7 @@ class ArduinoJsonAllocator {
     }
 
     void *allocate(size_t size) {
-        MO_DBG_DEBUG("ArduinoJsonAllocator allocate %zu B (%s)", size, tag ? tag : "unspecified");
+        MO_DBG_VERBOSE("ArduinoJsonAllocator allocate %zu B (%s)", size, tag ? tag : "unspecified");
         return MO_MALLOC(
                     #if MO_ENABLE_HEAP_PROFILER
                         tag,
@@ -352,7 +352,7 @@ class ArduinoJsonAllocator {
                     size);
     }
     void deallocate(void *ptr) {
-        MO_DBG_DEBUG("ArduinoJsonAllocator deallocate");
+        MO_DBG_VERBOSE("ArduinoJsonAllocator deallocate");
         MO_FREE(ptr);
     }
 };
@@ -361,7 +361,7 @@ using MemJsonDoc = BasicJsonDocument<ArduinoJsonAllocator>;
 
 template<class T, typename ...Args>
 T *mo_mem_new(const char *tag, Args&& ...args)  {
-    MO_DBG_DEBUG("mo_mem_new %zu B (%s)", sizeof(T), tag ? tag : "unspecified");
+    MO_DBG_VERBOSE("mo_mem_new %zu B (%s)", sizeof(T), tag ? tag : "unspecified");
     if (auto ptr = MO_MALLOC(tag, sizeof(T))) {
         return new(ptr) T(std::forward<Args>(args)...);
     }
@@ -370,7 +370,7 @@ T *mo_mem_new(const char *tag, Args&& ...args)  {
 
 template<class T>
 void mo_mem_delete(T *ptr)  {
-    MO_DBG_DEBUG("mo_mem_delete");
+    MO_DBG_VERBOSE("mo_mem_delete");
     if (ptr) {
         ptr->~T();
         MO_FREE(ptr);