that is available in the internal frame history of the gdk.frame_clock.FrameClock
FrameClock.getHistoryStart
long getHistoryStart()Returns the frame counter for the oldest frame available in history.
gdk.frame_clock.FrameClock internally keeps a history of gdk.frame_timings.FrameTimings objects for recent frames that can be retrieved with gdk.frame_clock.FrameClock.getTimings. The set of stored frames is the set from the counter values given by gdk.frame_clock.FrameClock.getHistoryStart and gdk.frame_clock.FrameClock.getFrameCounter, inclusive.
Returns
the frame counter value for the oldest frame