How can I optimize performance in my procedurally generated 2D platformer built with Three.js?

I'm developing a 2D platformer using Three.js, but I'm experiencing a continuous slowdown that eventually crashes the game.

I've included a link to the game.html file: 2d platformer v155.html (15.7 KB). When testing, the game increasingly slows down over time, and the code seems to behave unexpectedly, almost as if it were "alive."

I've tried various improvements (EDIT1), but they haven't resolved the issue.

Additional metrics:

• FPS Count:
  
• Memory usage increases steadily (EDIT3)

I also implemented Y-Greeding on this chunk of code (EDIT4) with the updated file: 2d platformer v195.html (13.5 KB), but the results remain the same.

Has anyone encountered similar issues or have suggestions for optimizing this game?