My 3D Cube renderer

So as you know recently some 3D renderers have became popular. So I decided to try that myself. And it worked!
The problem is it lags soooooooo much and you might not understand the shape of the cube unfortunately.

How it works on my computer vs. how it works on repl.it

On My Computer:

On repl.it :

Side note: You can change the color of the cube by left-clicking.

I couldn't solve the lag problem unfortunately, but have as much fun as you can with the renderer!