diff --git a/libdevcore/LevelDB.cpp b/libdevcore/LevelDB.cpp
index 74b74fafa..2a67bc5ea 100644
--- a/libdevcore/LevelDB.cpp
+++ b/libdevcore/LevelDB.cpp
@@ -97,7 +97,7 @@ leveldb::Options LevelDB::defaultDBOptions() {
     leveldb::Options options;
     options.create_if_missing = true;
     options.max_open_files = c_maxOpenLeveldbFiles;
-//    options.filter_policy = leveldb::NewBloomFilterPolicy( 10 );
+    options.filter_policy = leveldb::NewBloomFilterPolicy( 10 );
     return options;
 }
 
diff --git a/libethereum/BlockChain.cpp b/libethereum/BlockChain.cpp
index 8902b8ff0..07caef242 100644
--- a/libethereum/BlockChain.cpp
+++ b/libethereum/BlockChain.cpp
@@ -1252,6 +1252,8 @@ uint64_t BlockChain::getTotalCacheMemory() {
 }
 
 void BlockChain::garbageCollect( bool _force ) {
+    boost::chrono::high_resolution_clock::time_point gcTimeStart =
+        boost::chrono::high_resolution_clock::now();
     updateStats();
 
     if ( !_force && chrono::system_clock::now() < m_lastCollection + c_collectionDuration &&
@@ -1263,6 +1265,8 @@ void BlockChain::garbageCollect( bool _force ) {
 
     m_lastCollection = chrono::system_clock::now();
 
+    boost::chrono::high_resolution_clock::time_point gcTimeCycleStart =
+        boost::chrono::high_resolution_clock::now();
     while ( m_lastStats.memTotal() >= c_maxCacheSize ) {
         Guard l( x_cacheUsage );
         for ( CacheID const& id : m_cacheUsage.back() ) {
@@ -1312,6 +1316,12 @@ void BlockChain::garbageCollect( bool _force ) {
         m_cacheUsage.push_front( std::unordered_set< CacheID >{} );
         updateStats();
     }
+    boost::chrono::high_resolution_clock::time_point gcTimeCycleFinish =
+        boost::chrono::high_resolution_clock::now();
+    clog( VerbosityInfo, "bc" ) << "GCCT:"
+                                << boost::chrono::duration_cast< boost::chrono::milliseconds >(
+                                       gcTimeCycleFinish - gcTimeCycleStart )
+                                       .count();
 
 
     {
@@ -1324,6 +1334,12 @@ void BlockChain::garbageCollect( bool _force ) {
             assert( m_blockHashes.size() == 4096 );
         }
     }
+    boost::chrono::high_resolution_clock::time_point gcTimeFinish =
+        boost::chrono::high_resolution_clock::now();
+    clog( VerbosityInfo, "bc" ) << "GCT:"
+                                << boost::chrono::duration_cast< boost::chrono::milliseconds >(
+                                       gcTimeFinish - gcTimeStart )
+                                       .count();
 }
 
 void BlockChain::clearCaches() {