Hi all, I've been experiencing the same slowdown in many WebGL-based code. For instance, this simple example: https://test.looc.io/forest/index.html was running at 60 fps in previous releases. Then it become abysmally slower with the new Ventura update(13.1). However if you go to the Develop menu and disable WebGL 2.0, you will get much better performance if you are using webgl 1 (you will be out of luck with webgl 2 of course). If this is not intended to conserve battery power, it is definitely a bug.