Index: source/main.cpp
===================================================================
--- source/main.cpp
+++ source/main.cpp
@@ -330,21 +330,12 @@
 
 	ogl_WarnIfError();
 
-	// get elapsed time
-	const double time = timer_Time();
+	// Get elapsed time.
+	static double last_time = 0.0;
+	double time = timer_Time();
 	g_frequencyFilter->Update(time);
-	// .. old method - "exact" but contains jumps
-#if 0
-	static double last_time;
-	const double time = timer_Time();
-	const float TimeSinceLastFrame = (float)(time-last_time);
+	const float realTimeSinceLastFrame = (float)(time-last_time);
 	last_time = time;
-	ONCE(return);	// first call: set last_time and return
-
-	// .. new method - filtered and more smooth, but errors may accumulate
-#else
-	const float realTimeSinceLastFrame = 1.0 / g_frequencyFilter->SmoothedFrequency();
-#endif
 	ENSURE(realTimeSinceLastFrame > 0.0f);
 
 	// Decide if update is necessary