I'm getting pretty significant screen tearing despite enabling vsync in-game and enabling triple buffering through the .cfg file. Normally my next step would be to play the game in borderless windowed mode, but for some reason that absolutely tanks my performance. We're talking about a 10fps drop, it is bizarre.

Has anyone had any luck dealing with screen tearing any other way, or getting borderless mode to not kill framerate?

Disable all of that in-game vsync and use Nvidia Control Panel or whatever AMD has these days.

Are your drivers up to date? A lot of the games this fall had day one driver updates.

any windowed mode will always take a hit off your framerate, try adaptive vsync if you got nvidia card or force it in amd's control panel. I've not had any screen tearing issues myself.