diff --git a/contrib/epee/include/math_helper.h b/contrib/epee/include/math_helper.h
index 6a759b515..00d695179 100644
--- a/contrib/epee/include/math_helper.h
+++ b/contrib/epee/include/math_helper.h
@@ -24,213 +24,20 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // 
 
-
-
-
 #pragma once
 
+#include <cstdint> // uint64_t
 
-#include <list>
-#include <numeric>
-#include <random>
-#include <boost/timer/timer.hpp>
-#include <boost/uuid/uuid.hpp>
-#include <boost/uuid/random_generator.hpp>
-
-#include "syncobj.h"
-#include "time_helper.h"
+#ifdef _WIN32
+#include <sysinfoapi.h> // GetSystemTimeAsFileTime
+#else
+#include <sys/time.h> // gettimeofday
+#endif
 
 namespace epee
 {
 namespace math_helper
 {
-
-	template<typename val, int default_base>
-	class average
-	{
-	public:
-
-		average()
-		{
-			m_base = default_base;
-			m_last_avg_val = 0;
-		}
-
-		bool set_base()
-		{
-			CRITICAL_REGION_LOCAL(m_lock);
-
-			m_base = default_base;
-			if(m_list.size() > m_base)
-				m_list.resize(m_base);
-
-      return true;
-		}
-
-		typedef val value_type;
-
-		void push(const value_type& vl)
-		{
-			CRITICAL_REGION_LOCAL(m_lock);
-
-//#ifndef DEBUG_STUB
-			m_list.push_back(vl);
-			if(m_list.size() > m_base )
-				m_list.pop_front();
-//#endif
-		}
-
-		double update(const value_type& vl)
-		{
-			CRITICAL_REGION_LOCAL(m_lock);
-//#ifndef DEBUG_STUB
-			push(vl);
-//#endif
-
-			return get_avg();
-		}
-
-		double get_avg()
-		{
-			CRITICAL_REGION_LOCAL(m_lock);
-
-			value_type vl = std::accumulate(m_list.begin(), m_list.end(), value_type(0));
-			if(m_list.size())
-				return m_last_avg_val = (double)(vl/m_list.size());
-	
-			return m_last_avg_val = (double)vl;
-		}
-
-		value_type get_last_val()
-		{
-			CRITICAL_REGION_LOCAL(m_lock);
-			if(m_list.size())
-				return m_list.back();
-
-			return 0;
-		}
-
-	private:
-		unsigned int m_base;
-		double m_last_avg_val;
-		std::list<value_type> m_list;
-		critical_section m_lock;
-	};
-
-	
-#ifdef WINDOWS_PLATFORM
-	
-	/************************************************************************/
-	/*                                                                      */
-	/************************************************************************/
-	class timing_guard_base
-	{
-	public:
-		virtual ~timing_guard_base(){};
-	};
-
-	template<class T>
-	class timing_guard: public timing_guard_base
-	{
-	public:
-		timing_guard(T& avrg):m_avrg(avrg)
-		{
-			m_start_ticks = ::GetTickCount();
-		}
-
-		~timing_guard()
-		{
-			m_avrg.push(::GetTickCount()-m_start_ticks);
-		}
-
-	private:
-		T& m_avrg;
-		DWORD m_start_ticks;
-	};
-
-	template<class t_timing>
-	timing_guard_base* create_timing_guard(t_timing&  timing){return new timing_guard<t_timing>(timing);}
-
-#define BEGIN_TIMING_ZONE(timing_var) {		boost::shared_ptr<math_helper::timing_guard_base> local_timing_guard_ptr(math_helper::create_timing_guard(timing_var));
-#define END_TIMING_ZONE()			  }
-#endif
-
-//#ifdef WINDOWS_PLATFORM_EX
-	template<uint64_t default_time_window>
-	class speed
-	{
-	public:
-
-		speed()
-		{
-			m_time_window = default_time_window;
-			m_last_speed_value = 0;
-		}
-		bool chick()
-		{
-#ifndef DEBUG_STUB
-			uint64_t ticks = misc_utils::get_tick_count();
-			CRITICAL_REGION_BEGIN(m_lock);
-			m_chicks.push_back(ticks);
-			CRITICAL_REGION_END();
-			//flush(ticks);
-#endif
-			return true;			
-		}
-
-		bool chick(size_t count)
-		{
-			for(size_t s = 0; s != count; s++)
-				chick();
-
-			return true;			
-		}
-
-
-		size_t get_speed()
-		{
-			flush(misc_utils::get_tick_count());
-			return m_last_speed_value = m_chicks.size();
-		}
-	private:
-
-		bool flush(uint64_t ticks)
-		{
-			CRITICAL_REGION_BEGIN(m_lock);
-			std::list<uint64_t>::iterator it = m_chicks.begin();
-			while(it != m_chicks.end())
-			{
-				if(*it + m_time_window < ticks)
-					m_chicks.erase(it++);
-				else
-					break;
-			}
-			CRITICAL_REGION_END();
-			return true;
-		}
-
-		std::list<uint64_t> m_chicks;
-		uint64_t m_time_window;
-		size_t m_last_speed_value;
-		critical_section m_lock;
-	};
-//#endif
-
-	template<class tlist>
-	void randomize_list(tlist& t_list)
-	{
-		for(typename tlist::iterator  it = t_list.begin();it!=t_list.end();it++)
-		{
-			size_t offset = rand()%t_list.size();
-			typename tlist::iterator  it_2 = t_list.begin();
-			for(size_t local_offset = 0;local_offset!=offset;local_offset++)
-				it_2++;
-			if(it_2 == it)
-				continue;
-			std::swap(*it_2, *it);
-		}
-
-	}
 	template<typename get_interval, bool start_immediate = true>
 	class once_a_time
 	{
diff --git a/contrib/epee/include/string_tools.h b/contrib/epee/include/string_tools.h
index dbbe1906e..7fcd02726 100644
--- a/contrib/epee/include/string_tools.h
+++ b/contrib/epee/include/string_tools.h
@@ -127,7 +127,6 @@ namespace string_tools
 		return s;
 	}
   
-  bool validate_hex(uint64_t length, const std::string& str);
   std::string get_extension(const std::string& str);
   std::string cut_off_extension(const std::string& str);
   
diff --git a/contrib/epee/src/string_tools.cpp b/contrib/epee/src/string_tools.cpp
index 984a151b5..3abb83c74 100644
--- a/contrib/epee/src/string_tools.cpp
+++ b/contrib/epee/src/string_tools.cpp
@@ -82,16 +82,6 @@ namespace string_tools
     return true;
   }
   //----------------------------------------------------------------------------
-  bool validate_hex(uint64_t length, const std::string& str)
-  {
-    if (str.size() != length)
-      return false;
-    for (char c: str)
-      if (!isxdigit(c))
-        return false;
-    return true;
-  }
-  //----------------------------------------------------------------------------
   bool parse_peer_from_string(uint32_t& ip, uint16_t& port, const std::string& addres)
   {
     //parse ip and address
diff --git a/src/blockchain_utilities/blockchain_stats.cpp b/src/blockchain_utilities/blockchain_stats.cpp
index f65054fc5..f0a8e5adc 100644
--- a/src/blockchain_utilities/blockchain_stats.cpp
+++ b/src/blockchain_utilities/blockchain_stats.cpp
@@ -33,6 +33,7 @@
 #include "cryptonote_basic/cryptonote_boost_serialization.h"
 #include "cryptonote_core/cryptonote_core.h"
 #include "blockchain_db/blockchain_db.h"
+#include "time_helper.h"
 #include "version.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
diff --git a/src/cryptonote_basic/miner.cpp b/src/cryptonote_basic/miner.cpp
index 91ee86d60..4b0e43213 100644
--- a/src/cryptonote_basic/miner.cpp
+++ b/src/cryptonote_basic/miner.cpp
@@ -42,6 +42,7 @@
 #include "string_coding.h"
 #include "string_tools.h"
 #include "storages/portable_storage_template_helper.h"
+#include "time_helper.h"
 #include "boost/logic/tribool.hpp"
 #include <boost/filesystem.hpp>
 
diff --git a/src/cryptonote_protocol/cryptonote_protocol_handler.h b/src/cryptonote_protocol/cryptonote_protocol_handler.h
index a29ee8287..80582fad2 100644
--- a/src/cryptonote_protocol/cryptonote_protocol_handler.h
+++ b/src/cryptonote_protocol/cryptonote_protocol_handler.h
@@ -39,6 +39,7 @@
 
 #include "byte_slice.h"
 #include "math_helper.h"
+#include "syncobj.h"
 #include "storages/levin_abstract_invoke2.h"
 #include "warnings.h"
 #include "cryptonote_protocol_defs.h"
diff --git a/src/p2p/net_node.inl b/src/p2p/net_node.inl
index 4f77ce834..815c1b354 100644
--- a/src/p2p/net_node.inl
+++ b/src/p2p/net_node.inl
@@ -51,7 +51,6 @@
 #include "common/dns_utils.h"
 #include "common/pruning.h"
 #include "net/error.h"
-#include "math_helper.h"
 #include "misc_log_ex.h"
 #include "p2p_protocol_defs.h"
 #include "crypto/crypto.h"
diff --git a/src/wallet/wallet_rpc_server.h b/src/wallet/wallet_rpc_server.h
index 282035052..97fc0a278 100644
--- a/src/wallet/wallet_rpc_server.h
+++ b/src/wallet/wallet_rpc_server.h
@@ -35,7 +35,6 @@
 #include <string>
 #include "common/util.h"
 #include "net/http_server_impl_base.h"
-#include "math_helper.h"
 #include "wallet_rpc_server_commands_defs.h"
 #include "wallet2.h"