I had overclocked it to 1300 mhz and it seems to run fine. the latest bullseye release did not work well for me and my GL4ES adventures. so i tried an older release and was able to get 80 FPS on some Irrlicht Demos. after trying my game engine it was getting around 20 FPS ( notbad for first try ) if i can get that number upto around 35 with some resolution hacks then it’ll be ready for action.
2021-10-30-raspios-bullseye-armhf.img was the image that worked for me though it says 32 bit while booting.
https://irrlicht.sourceforge.io/forum/viewtopic.php?p=306725#p306725
