Thanks. Also, there's an option to disable the mini-screen thing so I have that turned off.

Thanks again.

It might depend on your connection. Personally, I keep my PS4 wired through the Ethernet, and experience no issues. On wifi it was a different story, but I've also been having intermingling issues with both my ISP and router concerning lag spikes. 

Also, the twitch feed will make your gameplay screen a little smaller, but I think it's a negligible issue.

If I streamed 720p@60fps from my PS4, could this effect the quality of online gameplay?

Thanks

Does streaming from PS4 effect gameplay?