To be completely fair, moving from the crappy FAT32 userstore to a proper ext3 internal partition and a slightly more effective, if complex, backend probably accounts for the fact that, on these new devices, collections handling is slightly less likely to murder the performance of the Kindle homescreen, especially on devices with a lot of content/collections. I's at least much more tightly wound into the system, compared to the 'slapped-on' feel of the feature added on FW 2.5 and still used on 3.x & 4.x.
(Meaning I'm of the mind that the move wasn't just to piss us off, there was a legit performance concern behind it. Although, maybe not terribly well thought out, because it can effectively softbrick a Kindle on very large (~5K) libraries...).
Last edited by NiLuJe; 10-04-2012 at 05:20 PM.