It looks like some settings lead to this error, from what I've seen/tried. Use different settings until it disappears. Or you can share you list of settings and I can try to tell you which one leads to this message. I ran into the same issue so I can try to help. I don't know why that happens either, but I've seen the same thing. When I try recording Doom, my FPS is unaffected. But WoW, simply having OBS open, leads to a significant (from 80 t0 73) FPS loss. This isn't related to this specific plugin tho, just an issue in general with OBS that I can't explain. Things are still being improved and tweaked. I personally have issues recording a smooth 60fps, regardless of settings used. Default OBS is smooth, this plugin somehow isn't. But this plugin feels more stable than default OBS.