Been trying to resolve this myself the last few hours but still in the same boat as i was yesterday..
I am using a fixed BG for a new personal project, now is Google chrome the site / scrolling is fine but under FF it's quite laggy, ive experienced this in the past with VB and WP but have managed to resolve the issue by either jquery scripts or creating new div's / placeholders for the BG, after many attempts / methods i am unable to resolve this laggyness under XF.. Any thoughts ? Anyone fixed this problem under XF ?
Demo Here: http://motorbikesforum.com/community/ <<--- Very much a work in progress and still only working on the front page so please bare with me, really want to use a fixed BG for this project as it provides a unique / different effect to the theme all tho only a minor thing it does help to contribute to the style so i would still like to keep it as fixed.
Thanks in advanced for any help on this matter.