Multiple Twitch tab lag

When running multiple tabs of Twitch streams the videos will freeze while the audio continues resulting having to pause/play the video or what for it to catch up. When there is 4+ tabs open one of more tabs entirely timeout requiring a fresh.

Could be a number of things (bandwidth, cpu/gpu perf etc), Also, does Chrome show the same issues?

Does using https://www.multitwitch.tv/ make much difference?