It looks like it’s gone here on my old OSX System, finally after so many years ! 
It runs very fast here, same performance as on PC.
I’m running it on a:
- MacPro early 2008 (MacPro3,1),
-OSX 10.11.6
-ATI Radeon HD 5770 1024 MB
-24GB Ram - Screen Resolution: 1680 x 1050
I haven’t tested it yet on my big screen yet which runs at 2560 x 1440.
If C 9.5 runs smoothly there we can consider that this old bug since SX is gone for good.
Anyone else running C9.5 at 2560 x 1440 or higher ?