high cpu usage on iphone 13 pro max

nathandr24,

You can find the best suggestion to get the most out of your battery here: Batteries - Maximizing Performance

This should help the performance. However, if you find that you're still having an issue you can reach out for additional support here: Get Support

Take care.

Thanks for posting in the Apple Support Community nathandr24,

It's not unexpected for an iPhone to generate warmth. If it get's warmer than the temperatures it's designed to operate it, you may see the device or it's display power off until cool, or it may display a message saying it needs time to cool.

You can find additional information on the subject, here: If your iPhone, iPad, or iPod touch gets too hot or too cold

If your iPhone isn't taking those actions mentioned above to moderate it's temperature, no change to the device or how it's used would be necceary, you can continue using it as you normally would.

Cheers!