Android app slow to start (6s to 10s in cold start) What really kills me, I did changes and changes over again(from layouts ...) to fight against this, what's really strange my app does not do heavy stuff(minimum functionality). I use 7 fragments, and FragmentContainerView , the default fragment contains just buttons to navigate to other fragments and adview I cleared fragments from codes, guess what stills slow in app start, which leaves two possibilities, either gradle or corrupt assets(vector only) my gradles: buildscript {...