Bug Report Preview large FPS drop when moving mouse on mesa/amd

[GloriousEggroll]

Hi. I'm using open source mesa drivers 18.1.5 (tried other versions as well), and in the preview window, when I move the mouse quickly in circles, even without a game open, the preview's fps drops tremendously. I do not have mouse acceleration on. My game plays perfectly fine. OBS works perfectly fine if i disable the preview. It does this regardless of window capture, monitor capture, or capture card. I regularly use a magewell usb capture device. It does this regardless of whether or not I'm recording. My stream is not set to anything crazy - 1280x720p, 60fps, 5000 bitrate, veryfast preset. My scene size is 1920x1080

System:
Kernel 4.17.4
CPU: Threadripper 1950x
GPU: Vega 64 and RX 580 (tried both)
OS: Arch Linux

 

[GloriousEggroll]

Hey just a heads up I resolved this. Turns out it's an issue with mouse poll rate. If it's over 500 it has a fit. drop it to 500 or lower and it's fine.