That’s good info. I’m getting CPU overload errors on my iPad mini 2 recording 4K hoping a change to 720p will help. Makes sense right?"max out the 4K data rate" doesn't mean anything, but what he probably tries to say is that you can only record 4K if you stream 720p which is correct. If you stream in 1080 you can only record 1080.
100% correct and no disabling the cache will not correct the problem. What will work is flying it in a cool environment. I flew yesterday and had no problems. But the temp is 32 here. Still if you fly a few batteries you will start having lag... I would not use the Mini 2 for flying DJI any longer.Not at all, what's taxing the pad is the downstream, not what's recorded on the aircraft. If you're filming 4K, the downstream is already 720p.
Mini 2 is just too slow, try disabling video cache but that will probably not be enough.