If anyone is interested in the changes to video settings in 6.1, I made a video which covers a lot of it about a week and a half ago:



Dropping the render scale down on the slaves will help performance. The in-game slider only allows you to drop down to 50%, but it can be dropped to 10% if you really miss 8-bit Nintendo games via the console command:
Code:
/console renderscale VALUE
It can be set to any value between .1 (10%) and 2 (200%).