Eliot Miranda uploaded a new version of Graphics to project The Trunk:
http://source.squeak.org/trunk/Graphics-eem.380.mcz

==================== Summary ====================

Name: Graphics-eem.380
Author: eem
Time: 30 June 2017, 10:58:57.420462 am
UUID: 2d63e219-e81d-4f2d-be24-39cc148d9203
Ancestors: Graphics-mt.379

Trim Dispplay flash: aRectangle time to 50ms

=============== Diff against Graphics-mt.379 ===============

Item was changed:
  ----- Method: DisplayScreen>>flash: (in category 'displaying') -----
  flash: aRectangle 
  	"Flash the area of the screen defined by the given rectangle."
  
  	self reverse: aRectangle.
  	self forceDisplayUpdate.
+ 	(Delay forMilliseconds: 50) wait.
- 	(Delay forMilliseconds: 100) wait.
  	self reverse: aRectangle.
  	self forceDisplayUpdate.
  !