diff --git a/contrib/epee/include/misc_os_dependent.h b/contrib/epee/include/misc_os_dependent.h
index 806d3e83..69ded09e 100644
--- a/contrib/epee/include/misc_os_dependent.h
+++ b/contrib/epee/include/misc_os_dependent.h
@@ -48,17 +48,17 @@ namespace epee
 namespace misc_utils
 {
 
-        inline uint64_t get_tick_count()
+        inline uint64_t get_ns_count()
         {
 #if defined(_MSC_VER)
-                return ::GetTickCount64();
+                return ::GetTickCount64() * 1000000;
 #elif defined(WIN32)
                 static LARGE_INTEGER pcfreq = {0};
                 LARGE_INTEGER ticks;
                 if (!pcfreq.QuadPart)
                     QueryPerformanceFrequency(&pcfreq);
                 QueryPerformanceCounter(&ticks);
-                ticks.QuadPart *= 1000; /* we want msec */
+                ticks.QuadPart *= 1000000000; /* we want nsec */
                 return ticks.QuadPart / pcfreq.QuadPart;
 #elif defined(__MACH__)
                 clock_serv_t cclock;
@@ -68,16 +68,21 @@ namespace misc_utils
                 clock_get_time(cclock, &mts);
                 mach_port_deallocate(mach_task_self(), cclock);
 
-                return (mts.tv_sec * 1000) + (mts.tv_nsec/1000000);
+                return (mts.tv_sec * 1000000000) + (mts.tv_nsec);
 #else
                 struct timespec ts;
                 if(clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
                         return 0;
                 }
-                return (ts.tv_sec * 1000) + (ts.tv_nsec/1000000);
+                return (ts.tv_sec * 1000000000) + (ts.tv_nsec);
 #endif
         }
 
+        inline uint64_t get_tick_count()
+        {
+                return get_ns_count() / 1000000;
+        }
+
 
         inline int call_sys_cmd(const std::string& cmd)
 	{      
diff --git a/contrib/epee/include/profile_tools.h b/contrib/epee/include/profile_tools.h
index d3b1e4db..f285fe48 100644
--- a/contrib/epee/include/profile_tools.h
+++ b/contrib/epee/include/profile_tools.h
@@ -57,8 +57,15 @@ namespace epee
 
 
 #define TIME_MEASURE_START(var_name)    uint64_t var_name = epee::misc_utils::get_tick_count();
+#define TIME_MEASURE_PAUSE(var_name)    var_name = epee::misc_utils::get_tick_count() - var_name;
+#define TIME_MEASURE_RESTART(var_name)  var_name = epee::misc_utils::get_tick_count() - var_name;
 #define TIME_MEASURE_FINISH(var_name)   var_name = epee::misc_utils::get_tick_count() - var_name;
 
+#define TIME_MEASURE_NS_START(var_name)    uint64_t var_name = epee::misc_utils::get_ns_count();
+#define TIME_MEASURE_NS_PAUSE(var_name)    var_name = epee::misc_utils::get_ns_count() - var_name;
+#define TIME_MEASURE_NS_RESTART(var_name)  var_name = epee::misc_utils::get_ns_count() - var_name;
+#define TIME_MEASURE_NS_FINISH(var_name)   var_name = epee::misc_utils::get_ns_count() - var_name;
+
 namespace profile_tools
 {
 	struct local_call_account
diff --git a/src/common/perf_timer.h b/src/common/perf_timer.h
index 56662ff2..bc8e0580 100644
--- a/src/common/perf_timer.h
+++ b/src/common/perf_timer.h
@@ -46,9 +46,9 @@ extern __thread std::vector<PerformanceTimer*> *performance_timers;
 class PerformanceTimer
 {
 public:
-  PerformanceTimer(const std::string &s, el::Level l = el::Level::Debug): name(s), level(l), started(false)
+  PerformanceTimer(const std::string &s, uint64_t unit, el::Level l = el::Level::Debug): name(s), unit(unit), level(l), started(false)
   {
-    ticks = epee::misc_utils::get_tick_count();
+    ticks = epee::misc_utils::get_ns_count();
     if (!performance_timers)
     {
       MLOG(level, "PERF             ----------");
@@ -69,9 +69,9 @@ public:
   ~PerformanceTimer()
   {
     performance_timers->pop_back();
-    ticks = epee::misc_utils::get_tick_count() - ticks;
+    ticks = epee::misc_utils::get_ns_count() - ticks;
     char s[12];
-    snprintf(s, sizeof(s), "%8llu  ", (unsigned long long)ticks);
+    snprintf(s, sizeof(s), "%8llu  ", (unsigned long long)ticks / (1000000000 / unit));
     MLOG(level, "PERF " << s << std::string(performance_timers->size() * 2, ' ') << "  " << name);
     if (performance_timers->empty())
     {
@@ -82,6 +82,7 @@ public:
 
 private:
   std::string name;
+  uint64_t unit;
   el::Level level;
   uint64_t ticks;
   bool started;
@@ -89,7 +90,9 @@ private:
 
 void set_performance_timer_log_level(el::Level level);
 
-#define PERF_TIMER(name) tools::PerformanceTimer pt_##name(#name, tools::performance_timer_log_level)
-#define PERF_TIMER_L(name, l) tools::PerformanceTimer pt_##name(#name, l)
+#define PERF_TIMER_UNIT(name, unit) tools::PerformanceTimer pt_##name(#name, unit, tools::performance_timer_log_level)
+#define PERF_TIMER_UNIT_L(name, unit, l) tools::PerformanceTimer pt_##name(#name, unit, l)
+#define PERF_TIMER(name) PERF_TIMER_UNIT(name, 1000)
+#define PERF_TIMER_L(name, l) PERF_TIMER_UNIT_L(name, 1000, l)
 
 }
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 404321e0..d1f5f0dc 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -3883,17 +3883,17 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::list<block_complete_e
           offset_map[in_to_key.amount].push_back(offset);
 
       }
-
-      // sort and remove duplicate absolute_offsets in offset_map
-      for (auto &offsets : offset_map)
-      {
-        std::sort(offsets.second.begin(), offsets.second.end());
-        auto last = std::unique(offsets.second.begin(), offsets.second.end());
-        offsets.second.erase(last, offsets.second.end());
-      }
     }
   }
 
+  // sort and remove duplicate absolute_offsets in offset_map
+  for (auto &offsets : offset_map)
+  {
+    std::sort(offsets.second.begin(), offsets.second.end());
+    auto last = std::unique(offsets.second.begin(), offsets.second.end());
+    offsets.second.erase(last, offsets.second.end());
+  }
+
   // [output] stores all transactions for each tx_out_index::hash found
   std::vector<std::unordered_map<crypto::hash, cryptonote::transaction>> transactions(amounts.size());