Posted this in one of the other threads, figured since this was popular I’d repost here too.
Do you guys run Logitech Gamehub (or Logitech G series software) by chance? I had a buddy running Windows 10 1909, i7 4790k, 24 gigs of ram and a gtx 1080 he was getting weird frame hitching only in WoW but his OBS when he was streaming would still be fine. Had him shutdown gamehub after saving his settings to his mouse and his WoW stopped hitching entirely.
I have a feeling its tapping the DirectX API in a weird way to try and do the whole “Color coordinate your lighting to your game” even if you’re not using that feature actively and as a result its killing FPS in game on systems that otherwise seem fine.
Most people report that turning Graphics API version to DirectX 11 Legacy makes the game playable but frames suck so its probably logitech eating up more available threads since DX11 Legacy mode is a single thread instead of trying to stream multiple at once. At least that’s my guess.