I'm using the daily build of upbge-eevee, I have a player mesh and camera parented to it. so when i press "P" and start moving the player, the material on character seems distorted. This problem does not appear when camera is not moving.

I think this is caused by viewport denoising.
You can try to disable it in render tab > sampling.
Then you can add the fxaa glsl filter:
Start game to see if it improves the rendering.
Note: Disabling viewport denoising can impact other eevee's post processing effects (AO for example), then if you disable viewport denoising, some eevee's post processing effects won't work properly.
EDIT: I added the tip here: https://github.com/UPBGE/upbge/wiki/Release-notes-version-0.3.0
Thank you very much. It worked.
Most helpful comment
I think this is caused by viewport denoising.
You can try to disable it in render tab > sampling.
Then you can add the fxaa glsl filter:
Start game to see if it improves the rendering.
Note: Disabling viewport denoising can impact other eevee's post processing effects (AO for example), then if you disable viewport denoising, some eevee's post processing effects won't work properly.
EDIT: I added the tip here: https://github.com/UPBGE/upbge/wiki/Release-notes-version-0.3.0