BUG- Framerate drops significantly if Automation is on

I did my first automated Aux send to a reverb just now on the Fairlight page, and whenever automation is active, my video playback becomes completely unusable and stutter-y. When I disable automation, playback is smooth again. If I leave the aux send level at 0dB sending the whole clip through the reverb, playback is also fine. Its only when automation is active that I get stuttery playback.
Issue is on Davinci Resolve 15b5 on Windows 10.
Issue is on Davinci Resolve 15b5 on Windows 10.