Updated to bEta 5 on my ipad 2. All the blur effects have been replaced by simple transparency! In safari when you scroll a page up, previously the page would blur behind the address bar area. Not its just see through. Same with notification centre and control centre. All these effects were running fine for me before uptil beta 4. And smooth ! Couldnt tell a difference in speed of ipad between ios 6 and beta 4. So not sure if this is a bug or planned by apple so they save some cool features for newer ipads. Its offensive. Considering this was all running smoothly before. If it isnt a bug.