iPhone 15 Pro Max screen wake up delay

You may try some of these steps, please check after each step...

1. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
2. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
   1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
   2. You can return settings to their defaults without erasing your content.
   3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
3. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.

The same thing is being discussed here, just the title is not very clear. Notice the number of me toos on it...

https://discussions.apple.com/thread/255234126?page=5

Sadly it's not a new issue. My 13 pro has had this exact same problem since updating to ios 16 last January. It goes away for a few hours after each update or a forced restart.

I have reported this issue multiple times in feedback but all those reports are still lying in open state without any update after a whole year. At this point I have lost hope it will ever be resolved.

Meanwhile my SE 1st gen wakes up instantly on ios 15. This, a laggy keyboard and UI stutters across ios 17 makes my 13 pro feel like a cheap android from 5 years ago.