diff --git a/cloud/filestore/libs/storage/tablet/bench/tablet_bench.cpp b/cloud/filestore/libs/storage/tablet/bench/tablet_bench.cpp
new file mode 100644
index 00000000000..407425bcbca
--- /dev/null
+++ b/cloud/filestore/libs/storage/tablet/bench/tablet_bench.cpp
@@ -0,0 +1,91 @@
+#include <cloud/filestore/libs/storage/tablet/tablet.h>
+
+#include <cloud/filestore/libs/storage/testlib/tablet_client.h>
+#include <cloud/filestore/libs/storage/testlib/test_env.h>
+
+#include <library/cpp/testing/benchmark/bench.h>
+
+#include <util/generic/singleton.h>
+#include <util/generic/vector.h>
+
+#include <memory>
+
+using namespace NCloud;
+using namespace NCloud::NFileStore;
+using namespace NCloud::NFileStore::NStorage;
+
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////
+
+constexpr ui32 BlockSize = 4096;
+constexpr ui64 FileSize = 1_MB;
+constexpr ui64 MixedBlocksOffloadedRangesCapacity = 1000000;
+
+struct TTabletSetup
+{
+    TTestEnv Env;
+    std::unique_ptr<TIndexTabletClient> TabletClient;
+    ui64 Handle = 0;
+
+    TTabletSetup()
+        : Env(TTestEnvConfig{
+            // Turn off logging in order to reduce performance overhead
+            .LogPriority_NFS = NActors::NLog::PRI_ALERT,
+            .LogPriority_KiKiMR = NActors::NLog::PRI_ALERT,
+            .LogPriority_Others = NActors::NLog::PRI_ALERT})
+    {
+        NCloud::NFileStore::NProto::TStorageConfig storageConfig;
+        storageConfig.SetInMemoryIndexCacheEnabled(true);
+        storageConfig.SetMixedBlocksOffloadedRangesCapacity(
+            MixedBlocksOffloadedRangesCapacity);
+
+        Env.UpdateStorageConfig(std::move(storageConfig));
+
+        Env.CreateSubDomain("nfs");
+        Env.GetRuntime().SetDispatchedEventsLimit(Max<ui64>());
+
+        ui32 nodeIdx = Env.CreateNode("nfs");
+        ui64 tabletId = Env.BootIndexTablet(nodeIdx);
+
+        TabletClient = std::make_unique<TIndexTabletClient>(
+            Env.GetRuntime(),
+            nodeIdx,
+            tabletId,
+            TFileSystemConfig{.BlockSize = BlockSize});
+        TabletClient->InitSession("client", "session");
+
+        auto nodeId = CreateNode(
+            *TabletClient,
+            TCreateNodeArgs::File(RootNodeId, "test"));
+
+        Handle = CreateHandle(*TabletClient, nodeId);
+        TabletClient->WriteData(Handle, 0, FileSize, '1');
+    }
+
+    void DescribeData(ui64 offset, ui64 length)
+    {
+        auto response = TabletClient->DescribeData(Handle, offset, length);
+        Y_ABORT_UNLESS(FileSize == response->Record.GetFileSize());
+    }
+};
+
+TTabletSetup* GetOrCreateTablet()
+{
+    // Ensure this singleton is destroyed first to avoid a crash
+    constexpr ui64 Priority = Max<ui64>();
+    return SingletonWithPriority<TTabletSetup, Priority>();
+}
+
+}   // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+
+Y_CPU_BENCHMARK(TTablet_DescribeData_1MiBRequestSize, iface)
+{
+    auto* tablet = GetOrCreateTablet();
+
+    for (size_t i = 0; i < iface.Iterations(); ++i) {
+        tablet->DescribeData(0, 1_MB);
+    }
+}
diff --git a/cloud/filestore/libs/storage/tablet/bench/ya.make b/cloud/filestore/libs/storage/tablet/bench/ya.make
new file mode 100644
index 00000000000..e250cbb6a16
--- /dev/null
+++ b/cloud/filestore/libs/storage/tablet/bench/ya.make
@@ -0,0 +1,21 @@
+Y_BENCHMARK()
+
+IF (SANITIZER_TYPE)
+    TAG(ya:manual)
+ENDIF()
+
+SRCS(
+    tablet_bench.cpp
+)
+
+PEERDIR(
+    cloud/filestore/libs/storage/testlib
+)
+
+PEERDIR(
+    cloud/filestore/libs/storage/tablet
+)
+
+YQL_LAST_ABI_VERSION()
+
+END()
diff --git a/cloud/filestore/libs/storage/tablet/ya.make b/cloud/filestore/libs/storage/tablet/ya.make
index 4f3b58537b2..5ed6f5ba25e 100644
--- a/cloud/filestore/libs/storage/tablet/ya.make
+++ b/cloud/filestore/libs/storage/tablet/ya.make
@@ -134,6 +134,7 @@ RECURSE(
 )
 
 RECURSE_FOR_TESTS(
+    bench
     ut
     ut_cache_stress
     ut_counters
diff --git a/contrib/ydb/library/actors/util/local_process_key.h b/contrib/ydb/library/actors/util/local_process_key.h
index bff8bef81b7..68d2025caa4 100644
--- a/contrib/ydb/library/actors/util/local_process_key.h
+++ b/contrib/ydb/library/actors/util/local_process_key.h
@@ -131,8 +131,9 @@ class TEnumProcessKey {
 
     static size_t GetIndex(const EnumT key) {
         ui32 index = static_cast<ui32>(key);
-        Y_ABORT_UNLESS(index < Enum2Index.size());
-        return Enum2Index[index];
+        const auto& enum2Index = Singleton<TEnum2Index>()->Enum2Index;
+        Y_ABORT_UNLESS(index < enum2Index.size());
+        return enum2Index[index];
     }
 
 private:
@@ -153,5 +154,8 @@ class TEnumProcessKey {
         return enum2Index;
     }
 
-    inline static TVector<size_t> Enum2Index = RegisterAll();
+    struct TEnum2Index
+    {
+        TVector<size_t> Enum2Index = RegisterAll();
+    };
 };