Program becomes randomly unstable

So for the past 10-11 months, I've been working on a sequel to one of my KA programs with around 22,000 lines of code, for the last 2 days recently the 1st level has now just brought me down to 20-30fps, the worst part is that in the Help Request, someone else with a slight underpowered computer (I'm on Acer Windows) has been seeing no issues for it running at 60fps, its specifically the 1st level, as in the others are somewhat as large and use alot of objects as the 1st level of the 1st ZONE. Even when porting the level back to a slightly older prototype, it works fine! I think either something broke in my program or something else. It's not running fine for me on the first level and I don't know what to do, I've tried restarting, shutting down, adding the 'DeKhan Function' and removing certain objects, and all of those things on my computer and doesn't work, even Chromebooks run fine for me! More of the suppose 'cause' is in the help request center on the actual program:

The link to it BTW

https://www.khanacademy.org/computer-programming/bluey-the-circle-2-beta/4648441985286144?width=800