Reply To: Check your scroll rate here

[Shikkediel]

Check this out – the slower rate on IE is definitely noticeable when you try to do an animation based on scrollTop :

Demonstration pen

When you scroll down at first and then scroll up again, you can see the CSS manipulation (blue background height) is lagging on the animation of the black block (using .animate()). Twenty frames a second apparently won’t cut it, MS guys…