When no VRChat installation is found, reloading domain will increase dramatically and generate lot of Editor lag over time.
Step to reproduce:
  1. Go to AppData/LocalLow/VRChat/VRChat/
  2. Rename or temporary move it (like if you never launched vrchat at least once)
  3. Open a Project that has Udonsharp
  4. Udonsharp will show a message in the console "Could not locate VRChat data directory for exception watcher..."
  5. Keep the editor idling for 5-10 minutes.
  6. Enter play mode and notice a very long reloading domain time.
After investigating the root cause of the issue, the issue is the "Listen for client exceptions" doing callback loops in the background, disabling it will temporary fix the issue, but a fix is in the PR.