Since updating to 7.4.0 Maps has become virtually unusable. It takes several seconds just to launch, let alone for the viewed area to come to full resolution. When scrolling. nothing registers for a while, then eventually it starts registering swipes but very juddery when moving across the screen. It's so frustratingly slow that I've resorted back to using Locations, and that's saying something. Any ideas on how to restore it to its former performance? I've already tried clearing the cache, to no avail.. Is it possible to roll back to a previous version?