I've been using the phone now for over 2 months and the performance is better than the old Oneplus1 all the apps I use are snappy and responsive with no lag that I can detect. I can't compare to any other phone as I've not used anything else during this time, and I am not a mobile gamer (or any type off, for fact) so can not say what game performance is like on the phone but I think it stands up to most mid range devices well. If it hadn't been for the 4G issue I would probably have stuck with the Oneplus1 and just flashed it and saved myself the &pound;200m but I'm happy and my wife will get an upgrade to her Nexus 4 at some stage.