Sorry, I missed this. Hopefully you'll see my reply.
Lag certainly was a problem for me with earlier pi models as well. The Raspberry Pi 4 doesn't have the lags, or at least I don't experience any. It's actually smoother than my laptop with YouTube videos. And it's quite fine with both hdmi ports in use. Probably not multiple videos at one time, of course.
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Sorry, I missed this. Hopefully you'll see my reply.
Lag certainly was a problem for me with earlier pi models as well. The Raspberry Pi 4 doesn't have the lags, or at least I don't experience any. It's actually smoother than my laptop with YouTube videos. And it's quite fine with both hdmi ports in use. Probably not multiple videos at one time, of course.