Hey!

Here's a problem and fix while using GSYNC with Snooper (Not common problem at all, but I'll post it here anyways)

I had GSYNC enabled for full screen and windowed mode. With windowed mode enabled it looked like I had 15hz monitor (mouse lags and brightness goes up and down back and forth) every time I had Snooper open. When closed or minimize everything went back to normal.

Enable GSYNC for full screen only and problem solved. <- That's actually default.