[Q] Advice on my new LG G3 topic

I originally had an LG G3 when it was released but after a few weeks grew tired with the lag on the phone, even though I thought everything else (Camera, screen, design, etc) was absolutely perfect. During the last few months, I've tested out every flagship phone and found the LG G3 was my favorite by far.

Anyway, I've ordered a brand new LG G3 which will arrive today at some point and wanted to ask if the lag had been fixed by software updates or it still persists or if there were any tips (without rooting) to make the phone work flawlessly as it should with the specs it has? Thanks =)