Interesting, thanks. I'll test this on a Raspberry Pi and report the results.

> On 1 Jan 2021, at 13:11, 'Chris Norman' via pyglet-users 
> <pyglet-users@googlegroups.com> wrote:
> 
> 
> Hi,
> I just tested your code on Windows 10, and I don't get the problems you 
> describe. My times didn't get about 0.52 seconds haha.
> 
> Wonder if it's another gift from Mac OS?
> 
> Take care,
> 
> Chris Norman
> 
> 
> 
>> On Fri, 1 Jan 2021 at 11:49, Mathieu <mathieu.dae...@gmail.com> wrote:
>> Apologies if this is obviously out of pyglet's scope/objectives.
>> 
>> Function calls triggered by pyglet.clock.schedule_interval() seem to occur 
>> at extremely variable time intervals after the pyglet window is 
>> hidden/minimized (this is on macOS Catalina, in case it matters).
>> 
>> Below is a minimal example that should print out a number not much greater 
>> than 0.5 every half second. Instead, after a few seconds of the window being 
>> minimized, calls are delayed by up to 10 seconds.
>> 
>> I'm (baselessly) assuming this is because pyglet is designed to function 
>> with lower priority when the window is not visible. I dont really care if my 
>> functions calls occur every 0.6 seconds instead of 0.5, but a 10s lag seems 
>> unreasonably large.
>> 
>> Is there a simple way to ensure pyglet maintains a high priority and/or does 
>> not drastically alter the frequency of scheduled calls?
>> 
>> ----
>> import pyglet
>> window = pyglet.window.Window(width = 128, height = 128)
>> 
>> @window.event
>> def on_draw():
>>     window.clear()
>> 
>> def foo(t):
>>     print(t)
>> 
>> pyglet.clock.schedule_interval(foo, 0.5)
>> pyglet.app.run()
>> ----
>> 
>> Typical output below:
>> 
>> ----
>> 0.5010913940000137
>> 8.22102221900002
>> 10.501081690999968
>> 10.501448707999998
>> 10.501421234999953
>> 3.7303194810000377
>> 10.501095133000035
>> 0.5011976460000369
>> 10.501220476999947
>> 10.501225187000045
>> 4.144422970999926
>> ----
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