Looking at the enemy team DOES NOT cause FPS lag - Dafran states that it was just a joke for content and then tests the theory he joked about - It doesn't actually work.
You can see a clip of the end of it here: https://clips.twitch.tv/AuspiciousDreamySangMikeHogu
Or watch from the start where he talks about it here:
https://www.twitch.tv/videos/613732988?t=9h10m9s (Edit: It's a timestamped link, if you click it, it will take you to the part of the vod where he starts talking about it)
I'm posting this because people are starting to panic. Just a reminder, it's important to keep in mind that you shouldn't believe everything without concrete evidence.