Haha XD, Sorry about all that dude, No its Crypto Miner or anything like that, The Reason it performs so badly is because the game is Veryyyyy Badly optimized and I focused more on graphics this time around rather than Performance which is a major Oversight on my behalf, The bad optimization stems from quite a few things but most notable its from Compiler errors while entering different levels (especially when you get the cookie and win) and The Most major Flaw is that I for some reason had all the light sources in my Game set to REALTIME Shadows which is fine with one or two light sources but with like 36 Realtime lights There's a clear answer as to what went wrong, I completely forgot all about Optimization which isn't difficult at all for me and can easily be fixed but the Realtime lighting is super embarrassing XD and i totally forgot it was enabled by default and All this has reminded me another thing, I think i might've just accidentally left Realtime lighting ON on a dew of my other games so yeah, I've got some major bug fixing to do still, Thankyou for letting me know it was severe severe enough it was lagging on a 4090 build. I didn't think it was that severe :D
Btw, The game does work fine on my laptop even when its a built exe, and so it is possible your PC is facing a CPU bottleneck ( assuming its a Custom Build)