What video card are you running?
Also, turning down the resolution might help. Another idea: If you are playing in a Windowed-Mode (Windowed or Borderless Windowed), try running the game in Full-Screen. Playing in Full-Screen will definitely increase your performance, but make it harder for your computer to shift tasks, because your computer has to unload and reload the game every time you alt-tab.
EDIT: After reading through the benchmark settings, I suggest you DISABLE AMBIENT OCCLUSION IF YOU HAVE IT ACTIVE! I guarantee over9000+ points to your performance if you do so.
Also, turning down the resolution might help. Another idea: If you are playing in a Windowed-Mode (Windowed or Borderless Windowed), try running the game in Full-Screen. Playing in Full-Screen will definitely increase your performance, but make it harder for your computer to shift tasks, because your computer has to unload and reload the game every time you alt-tab.
EDIT: After reading through the benchmark settings, I suggest you DISABLE AMBIENT OCCLUSION IF YOU HAVE IT ACTIVE! I guarantee over9000+ points to your performance if you do so.