Shurkien particles and "Application.UpdateScene"

Unity Engine
1

Hello,
This terrible bug continues since Unity 5.5.
Any changes of particle system causes the editor to freeze for a few seconds.
1k particles ~5 seconds
5k particles ~8 seconds
10k particles ~20 seconds
20k particles ~1 minute.

Impossible to work with a particle system when any change requires waiting 100500 seconds.
Any ideas?

9142720--1270315--upload_2023-7-13_1-10-46.jpg
9142720--1270315--upload_2023-7-13_1-10-46.jpg2015×1263 679 KB

Looks like unity update each module per particle?
For example, I have “noise”, “shape” and “velocity” module. 20k particles * 3 active modules = 60k updates in the profiler. WTF?

the only way to speed up the particles is to turn off playback → change the parameter → turn on playback

2

Is this maybe due to „warmup“?
Not sure if you can do that with Inspector, I only remember that as a particlesystem flag, probably in the Start method.

3

I found what cause this problem.
If this toggle is checked then I have this bug.
9142756--1270324--upload_2023-7-13_1-31-53.png
I think unity must disable it by default.