Just wanted to share my experience here: So I decided to tweak my phone after I had enough of 360p mp4 videos lagging pretty badly. Also I wanted to use the N9 QuickTweak app together with FasterN9. I had flashed my phone once before to PR 1.3 but that was quite some time ago so my phone was already full of apps with inception and other stuff installed. I proceeded to first install FasterN9 and straight on without a reboot N9 QuickTweak, installed the follow tweaks in one go: A Speed Up Transitions MODs (Only Speed Up Transitions) C Change smartsearch priority Q Enlarge Caller ID Avatar R Change standard emoticons X Enlarge/Restore conversation font size Rebooted and... wow. I have the smoothest, fastest harmattan, ever. And of course videos stopped lagging. About GPS, I feel it's getting the signal faster than before. It's been a few days and no problems what so ever.. tried to reboot many times, no probs. many thanks to everyone involved!