I preordered my at&t lg g3 about a month ago with extremely high hopes, and coming from a jailbroken iPhone 5. Compared to it the UI functionality, battery life, screen resolution, openness of android, subpar camera quality, and many other features made me absolutely swoon over how amazing it was compared to that iPhone garbage. I have one really big problem with it though. Straight out of the box when I revived my lg, I have noticed major ui and app lag. Even after a month, the lag has remained persistent, even after many pointless factory reset and screwing around online to try to find a fix for the lag. I did root this phone, but I know good as well that rooting it did not do anything too the device to affect performance. I just installed some xposed modules such as removing the d delay between taking screenshots, the g3 tweaksbox from the play store (which I highly recommend paying 1.50 for three full version, it's Amazing), and getting rid of ads. The funny thing is, I expected my g3 to perform on par with smartphones with identical specifications, (snapdragon 801, krait 400, 3gb ram, 32gb memory). My brother has a galaxy s5, and I've run many tests between my phone and his, like app performance in games, opening/closing apps, antutu benchmarks, overall ui performance, and his phone basically destroys all off those tests against my phone. WHY?? I do realise that yes, the qhd screen does require more raw performance compared to fhd (I think I read somewhere it was 15%?), but most apps aren't optimised for qhd and put themselves to fhd, so why would a game like fruit ninja run at like 20 fps at fhd on my g3, and 60 fps on the s5, which is also rooted with the same amount of modules? And it's not just arcade fruit ninja either, games like temple run 2 lag when you get to a higher score, apps like tinberman open faster on my jailbroke iPhone 5 then my g3, and sometimes simple arcade games like don't touch the spikes have an occasiaonal stutter when you hit a spike, or just playing in general. I have also seen youtube videos of the g3 vs the s5 with opening apps and app performance, and they perform THE SAME! Plus the Ui didn't lag on YouTube either, my Ui scrolling between app pages (that's the Ui I'm mostly talking about, sometimes I also get lag in the stock browser and messaging app, but that's a different story) dips far below 30 fps, I would be able to tell if it was on YouTube because of the frame rate cap. I'm just fed up with it. I truly do love it though, in my opinion in has the best take on 4.4 kitkat I've seen, and coming from ios I still consider this ROM clean. Now for you, the xda forum what do you think I should do about my problem? I do not want any other phone but the g3. Should I unroot and flash stock Rom back onto my device and take it to at&t? I got this phone through the at&t next plan, so I'm not sure how they deal with warranties. Maybe they would give me a new device if I showed them the problems with it? I am running kitkat 4.4.2 if that helps.