Thank you for the suggestions. I have done some more testing today, and I can’t seem to reproduce the lag that I was experiencing the other day. Now it works just as well fullscreen as non fullscreen. Maybe it was because I had more processes running…
I am still having problems with the black borders when I go fullscreen. I have tried to match the canvas resolution with the unity app resolution with the actual full screen resolution of the screen, but without any luck. It also seems like the graphics are scaled up, so I get quite a grainy image when I go full screen. I wonder if there are some settings in the Quartz Composer syphon plugin that I should tweak?