Hi. Made a simple practice hack w/frame counter if anyone is interested. It shows your room time (including lag frames) whenever you transition or use elevator for now. I don't think the code should affect lag much or at all, but maybe someone who knows the game better can test and give feedback on that.

Also you can toggle Kraid hitpoints counter by pressing "right" on the dpad during a pause. Using it has a bigger chance of causing extra lag than the frame counter, but idk the fight well enough to tell.