Another factor I discovered in times past (which may have been changed by now) that eats up CPU cycles is the "Default" button style. Do you possibly have one of those on your stack?

Phil Davis


On 9/30/20 7:30 PM, Neville Smythe via use-livecode wrote:
I have just noticed something curious.

I am running LiveCode 8.1 IDE 9.6.1 on a Mac Air 2020 quad core Catalina.

Typically LC cpu usage shows about 34%  (presumably of 1 core).  When a modal 
stack is opened it immediately ramps up to 99% ; the fan kicks in, and if left 
for a while the OS boosts the kernel_task daemon which I have been told is a 
protection device to prevent overheating. This has the effect of very markedly 
slowing down all apps as they get less cpu time.

If the stack is opened in non-modal mode, cpu usage stays around 34% . I don’t 
understand why a modal stack should be a cpu hog, indeed it seems like a bug to 
me.

I have a suspicion the wait with messages command  may have the same effect on 
cpu performance, so it could be the culprit.





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