Smooth delta time

[belohlavek]

Basically, it does exactly what it says; it smooths the deltaTime:

Say the frame rate is humming along at 30 fps, then you experience a hiccup of a few frames at 15. DeltaTime will report a difference of 2 ms (30 fps = 2ms / frame, 15 fps = 4ms / frame), but smoothDeltaTime will report something closer to 2ms (but weighted by the frame loss).

https://forum.unity.com/threads/time-smoothdeltatime.10253/

Note: this should not be part of the core ECS, buit an supeset on top of PIXI's update loop