High FPS Rendering

### Describe the feature or problem you'd like to solve

Curently Copilot CLI renders at a very low framerate and it feels very clunky

### Proposed solution

I'm not quite sure what is causing the low FPS (manual cap or just slow code) but it would be nice to be able to run the TUI app at +120 FPS. It would improve the experience with the CLI tool a lot.

### Example prompts or workflows

_No response_

### Additional context

_No response_

The issue names no files, tests, or rendering entry point. Start by locating the Copilot CLI TUI rendering path and measuring its current frame rate to determine whether a manual cap or slow rendering is responsible. Done means the cause is identified and the CLI can render smoothly at 120 FPS or higher.

Scritto dal modello di indicizzazione a partire dal testo della issue.