Hello! I just got to the Spider Boss at the end for the first time in The Jungle, and while I was halfway through the fight the game became unplayable because the framerate suddenly dropped to what feels like 0.5 FPS.

I checked out the JavaScript Platform, and it seems stuck on spamming this command:

I pulled out Task Manager to force close this, and if it makes a difference at all I was playing with The Senshi/Sailor Moon mod.