Streamer Trckzz noticed that in the PC version of Call of Duty: Modern Warfare 4, the frame rate drops significantly when a flashbang grenade is pulled out.
He published a video showing that Modern Warfare 4 on his PC runs at 230-245 frames per second, but the frame rate drops to 120-130 when he pulls out a flashbang grenade.
@xdTrckzz
Commentators note that this problem is not observed on consoles and emphasize that Call of Duty developers have always been quite sloppy with PC game optimization, paying more attention to PlayStation and Xbox versions.