> Any video player, playing any fast paced video you'll see X11 struggle to keep up with drawing full frames that it'd just give up and draw half of one frame and another half of another frame and call it a day.

What hardware are you running on?

Among the many systems I have, I have a laptop running an Intel 945GM [0]. I don't see the behavior you're reporting even if I have it hooked up [1] to a 1080p external display. On that system, I have zero Xorg config files... it's all default settings.

I also don't see the behavior you report on any of my much more powerful systems.

[0] Integrated graphics chip released somewhere around 2006

[1] Via VGA cable!