For my Samsung Galaxy S4, the latest update, 1545VRUGOF1, performance is not TERRIBLE. I have zero wifi connectivity, 4G LTE internet is slower than the old 3G- 1.5mbps Down, 0.89mbps Up. This is through various browsers and internet-connected apps. Worse, since the S4 is now clearly struggling for connections, battery life is bad, too... and the phone gets very hot. Benchmarks are now 1/4 of previous results- for example, on Quadrant Standard, my S4 consistently gave 12,xxx results and now it's in the 3,xxx range. Honestly, I feel like I'm using my old Droid X from 2010. I've powered down and up many times, removed the battery, etc. I'm not thrilled with the idea of a factory reset since I'm not willing to lose all my data (text messages, settings, etc). I've been a Verizon customer for over a decade and this problem is simply unacceptable.