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What type of iOS device are you using? DJI has recently added a bunch of behind the scenes logging that seems to take up a lot of CPU power that was previously available to apps. This additional load seems to be affecting older iOS device by making them lag behind as you are describing.
We are working with DJI to get a way to disable this logging but until then, workarounds include making sure as many other apps are closed as possible, turning off the "Image Footprint" feature if it is being used, or getting a newer/faster iOS device.