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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