System:
3700X (Latest Chipset Drivers)
X570 Tomahawk (Latest BIOS)
Crucial 3600 C16 16GB RAM
MSI RX 5700 Gaming X (Latest drivers)
Acer 24G2/BK 144Hz Monitor (DP) 1080P
Asus 60Hz Monitor (HDMI) 1080p
Windows 10 Pro Latest Update
System is just over a month old but have been having this issue since then. didn't pay much attention earlier.
When playing a game (League of Legends) and having anything open on second monitor (YouTube or Twitch) Game FPS drops from 300+ to 125, 160, 200.. very random. Tried setting the FPS limit to 144, 240 and unlimited and having the same issue. Stuttering just doesn't go away unless I close videos.
Full screen doesn't fix it but borderless is even worse.
I've disable hardware acceleration on Firefox
I've turned off AMD freesync, chill, anti-lag, image sharpening. Basically everything but the issue is still there.
background Apps
Razer Synapse 2
Logitech G Hub
Never had this issue with RX580 8GB
Any help would be great..