Modal stacks cpu usage

Richard Gaskin ambassador at
Thu Oct 1 12:28:48 EDT 2020

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
  Ambassador at      

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