[TD-Linux]

That's a bit odd, what browser is this? The fixed background should be handled by compositor layers, and while it is certainly more expensive than having a scrolling background, I'm surprised it makes the experience unusable.

[slrz]

Unusable is a bit extreme a description but I also experience the comparatively slow scrolling. It's worse at the top of the page.

It's not a Mac thing like other commenters suspect---I'm on Linux, using Firefox.