macOS high CPU usage on `theme watch`

There is a high CPU usage when the `theme watch` command is left active for large periods of time. It makes my macbook fans run on high. The current solution is to exit it, and start the `theme watch` command again.

I know it only happens when the `theme watch` is active for a large period of time, but I thought I would mention it in case there is a process loop that is multiplying itself.