I recently started to stream on Twitch when I play Overwatch and found that you quite have to fiddle around with your settings until you get it right. So, I created this OBS Twitch settings guide to give you a little help to set up a lag-free stream.
Calbirate Screen with DisplayCAL and Spyder5
After making a video on the topic, I thought it might also be helpful to have all of it in written form because this is a long and complex topic. I will shed some light on why to calibrate your screen with displayCAL and a Spyder 5.