Trying to optimize android game for any phone

Hi. I have a project game which works great on my test device, and the second device, which runs into freezes each time I run the game. I checked with profiler, everything looks fine. I even removed settargetframemate from code, so vSync will remain turned off, but it made everything even worse on second phone. Any ideas how to optimize that? The game is already optimized, judging by profiler stats. I know its hard to say something without actually seeing project settings. Vsync is off, minimum android sdk set to 6 though both phones run on android version 9. Shadows are turned off, garbage collector seems fine, limited update calls by if statements. Anything else that comes to mind? Thanks in advance