I want to first say I'm new on flying a drone. With that my question is on start up and before I receive (ok to fly window) there is a message that pops up and states your attached device CPU is full and may affect drone flight. As soon as the ok to fly message displays it goes away and there no trouble with the Drone flying. I'm questioning if the problem is in my IPhone, the App, or Controller. Thanks in advance if you can help me to get this corrected.

Perhaps you could post a screen shot of the message.

This usually means the CPU on the device is operating at or close to 100%. Some activities may be affected, such as intermittent live video feed, Quick Shots, Focus Tracks, etc. I have heard of reports where turning off cache recording can help as reported by iPad Mini 4 users. You can also try rebooting the device just before you go out to close background processes.

Pappy3 Posted at 2-4 05:39
This usually means the CPU on the device is operating at or close to 100%. Some activities may be affected, such as intermittent live video feed, Quick Shots, Focus Tracks, etc. I have heard of reports where turning off cache recording can help as reported by iPad Mini 4 users. You can also try rebooting the device just before you go out to close background processes.

First off thanks for the reply from you and the DJI Rep. Last night I deleted and reinstall the Dji Fly App, a cleanup on my phone (Iphone). And this morning I done a startup and fly around with no problems at all. As stated I’m new a this Drone flying and I appreciate the help you all have given. Take care and be safe.
Ron

Also follow these instructions to clear iPhone .

https://www.iphonelife.com/content/how-to-make-your-iphone-faster-clearing-ram

Gumball Posted at 2-5 09:33
Also follow these instructions to clear iPhone .

https://www.iphonelife.com/content/how-to-make-your-iphone-faster-clearing-ram

Thanks for the instruction on clearing the RAM. Completed with no problems.

Hi, djiuser_4OkaDTuBMhUD. Thanks for reaching out! As already been mentioned, it means that the CPU of your mobile device is nearing its max capacity or already full. We recommend checking whether there are background applications running on your mobile device and temporarily close them while using the DJI Fly.