Doom emacs gets slower over time editing rust files.

### What did you expect to happen?

Performance is consistent.

### What actually happened?

Performance degrades over time, I suspect related to the act of editing the file.

Performance gets better if I leave it for 10 mins idling.

Emacs process is pinned at 100% for a few seconds when it gets really bad, so it's not `rls` latency or anything like that.

There's a bunch of errors:

https://gist.github.com/YellowOnion/f648cb458ad0127b04e6049631d64456

### Describe your attempts to resolve the issue

I tried profiling but not sure how to expand the results in evil mode.

LSP mode is disabled in `init.el` but it's still running which is probably causing more issues (clashes between racer and rls?)

### Steps to reproduce

Edit rust file for 10 mins or so.

### System Information

https://gist.github.com/YellowOnion/f648cb458ad0127b04e6049631d64456