What's with this?

[rezerekted]

http://www.testufo.com/#test=framerates

Run this in Firefox it shows correctly 144hz, run it in IE and it shows only 72hz.

Ran it in Linux too and it said Linux does not support vsync, which explains why videos have tearing in Linux.

 

[Armenius]

What are you asking, exactly? IE only supports up to 100 Hz, so it is cutting the refresh rate in half at 144.