So, earlier I submitted a ticket like this, but since then I acquired more knowledge on this problem. It's caused by 2d ui elements, not sure why(I have a theory but on that later) but opening certain windows will make the game much less stable and in result everything runs at 15 fps on the lowest or highest settings. It's not related to throttling, my phone is barely warm when I play bdm(I play at 30 fps). So, on my theory... Relaunching the game helps, and therefore I assume that the game stores some info or anything else about those 2d elements but forgets to erase them from cash, presumably? And btw, without any 2d elements (after completing a mission, for example) game starts running smoothly(only without ui doe :c)