Modal stacks cpu usage

Phil Davis phil at
Thu Oct 1 02:16:34 EDT 2020

Sorry Neville, I didn't read your email closely enough - you are 
obviously on the right track.


On 9/30/20 9:02 PM, Phil Davis via use-livecode wrote:
> 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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Phil Davis

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