[Cuis] Curious drawing performance issue

[Phil (list)]

I should also mention that the Morph window is ~ 500x450 and #stepTime
is set to 0 for anyone who wants to try to replicate...

On Wed, 2015-08-12 at 17:36 -0400, Phil (list) wrote:
> I noticed a while back that something appeared to be going on with Cuis
> drawing performance (at idle on my system Morphic consumes ~20% of VM
> CPU *miniumum* according to ProcessBrowser) and this seems to give an
> indication of what it's currently costing in drawing performance...
> 
> After seeing the Squeak 5.0 announcement, I was curious to see roughly
> how much of a speed boost we might be able to expect from Spur down the
> road.  So I decided to look at BouncingAtomsMorph to try to get a rough
> apples-to-apples comparison and was quite surprised: Spur was faster,
> but it was too much faster.  So I dropped back to Squeak 4.5 and it also
> performs much, much better than the Cuis version on the same VM.   Here
> are the numbers I'm seeing using BouncingAtomsMorph with roughly
> comparable (i.e. eyeballed) morph sizes and atom count set to 5000:
> Squeak 5.0 (Spur VM from all-in-one download): 29-31 fps
> Squeak 4.5 (Cog VM 15.25.3390): 24-26 fps
> Cuis 2440 (Cog VM 15.25.3390): 6-8 fps
> 
> Granted BouncingAtomsMorph is not 100% identical from a source code
> standpoint but it's not nearly different enough where I'd expect that
> sort of difference.  Is this a platform-specific issue (I'm on Linux) or
> are others noticing drawing issues as well?