@pztrn you're right I do the same here and it improves the situation a LOT but it was clearly not enough with old firmwares. IDK why but maybe it's because I am on old buildings... Or the yoga 1 and 2 (I have the 2 not pro) are differents for the antenna
I don't know if it's the placebo effect but the #nexus4 with #android 5.1 feels more snappier than with 5.0 ! And the memory leak seems fixed, the system and apps use less ram (confirmed by screenshots).