macOS Repaint throttling - small change, big effect!

[chkn]

A macro like this would do the job too. @ed95 ?

#ifndef MACOS_MAXIMUM_REPAINT_FREQUENCY
      #define MACOS_MAXIMUM_REPAINT_FREQUENCY 30
#endif
         
static uint32 minimumRepaintInterval = 1000 / MACOS_MAXIMUM_REPAINT_FREQUENCY;