Embed appears to cause manim to peg an entire CPU core

### Describe the bug
From what I can tell, compared to the typical event loop during scene playback, after the `embed` event loop kicks in, `manim` will start to completely peg a core, resulting in elevated CPU usage, battery usage (on laptop) or thermal throttling.

### Additional context
I only did a brief investigation but am not yet sure what might be causing the event loop sleep timer or vsync to get disrupted by the embed. I decided to file the issue first and investigate more later -- pointers appreciated.