I get 10fps regardless of settings with all 5 screens enabled. <30% CPU and 10~20% GPU usage.
If I drop to 3 screens, I get 80+fps on low and 25 fps with everything maxed. CPU usage up to 50% and GPU is 80% with maxed settings.
I have 5 screens in portrait. Resolution is 5400x1920 for 5, and 3240x1920 with 3.