PerformanceTimer will no longer run while in release

include/Engine/Core/PerformanceTimer.h

@@ -2,8 +2,11 @@
 #define PerformanceTimer_h__
 
 #include "../Common.h"
+
+#ifdef DEBUG
 #include <boost/timer/timer.hpp>
 using boost::timer::cpu_timer;
+#endif //DEBUG
 
 class PerformanceTimer
 {
@@ -17,9 +20,11 @@ public:
     static void CreateExcelData();
 
 private:
+#ifdef DEBUG
     static std::map<std::string, cpu_timer> timers;
     static cpu_timer m_Timer;
     static std::string currentTimerRunning;
+#endif //DEBUG
 };
 
 #endif