Gotham City Impostors
From PCGamingWiki, the wiki about fixing PC games
Gotham City Impostors is a multiplayer fps that pits Batman impostors vs Joker impostors in Gotham City while Batman is away.
If you've purchased the game on Steam, don't run it from steam. Go to C:/Program Files/Steam/steamapps/common/gotham city impostors/Impostors.exe Run the game from Impostors.exe instead of Steam. The game runs significantly better without the Steam overlay.