Neville Smythe wrote:

> 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.

Confirmed here on macOS 10.14.5. The CPU load is indeed quite dramatic with modal dialogs.

I also checked on Linux (Ubuntu 18.04), and LC does not exhibit the problem there.

Have you opened a bug report on this?

 Richard Gaskin
 Fourth World Systems
 Software Design and Development for the Desktop, Mobile, and the Web

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