Re: toward a more efficient event loop

If there is a better strategy in Cuis, we should adopt it if possible. 
There is a lot of good design thinking in Cuis.

Do you have a pointer (class/method) to where this is implemented in the 
Cuis image?

Thanks,

Dave

On 2026-08-22 19:18, Nicolas Cellier wrote:

> Hi all,
> if you compare Cuis morphic feel to Squeak morphic feel, the former 
> looks snappy, the latter sluggish.
> Especially if your trackpad generates a bunch of MouseWheelEvent 
> (MouseScrollEvent in Cuis) whenever you're willing to scroll.
> Why is that?
> 
> Squeak World goes through an interCyclePause:  at every mouse event.
> Indeed, when the hand processEvents it stops at first mouse event 
> encountered.
> 
> Hence, unless you are ready to sacrifice some battery life with a 
> Preferences higherPerformance,
> the event buffer might take several seconds to drain with such 
> strategy, especially on mac.
> It makes the user experience somehow catastrophic.
> 
> Cuis has a different strategy:
> - processEvents drains the event buffer.
> however, it only processes one mouse move event per cycle, and drops 
> the other ones.
> - the world cycle doesn't pause if (lastCycleHadAnyEvent or: [ 
> deferredUIMessages isEmpty not ])
> - it also does not pause further than the next morphic step or alarm
> - the pause grows gradually from 20 to 200ms whenever there is no 
> activity
> but at least %)ms in server mode
> 
> Maybe it's time to revise our strategy too !
> 
> Nicolas
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