Hey @jpl, thank you for reporting this!
If you notice the floating window being sluggish again, could you open the inspector by pressing ⌘+⌥+I inside of the floating window, then click the Performance tab and start a recording for a few seconds while you’re using the app?
Here’s a video of the process:
This will help me figure out if there’s any part of the code in particular that causes the UI to become sluggish.
I’m looking forward to your reply!