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Mail message slow to load on iPhone.

Using the standard mail app on Mac and iPhone. Messages load immediately on Mac but extremely slow on iPhone connected to same wifi. Message header is there but when I click on it it takes ages to load the actual message, sometimes 20 seconds or more. It loads fast on 3 or 4G. I have reset Network settings several times with no luck.


An interesting thing I found the other day by accident is that if I have VPN turned on message load instantly.


So summing up mail loads fast on Mac on Wifi, loads fast on iPhone if on 3 or 4G and also if VPN is on but very slow on iPhone on Wifi.

iPhone 8 Plus, iOS 16

Posted on Aug 8, 2023 10:08 PM

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Question marked as Best reply

Posted on Apr 1, 2024 3:40 PM

Same problem.

Latest version on iOS (17.4.1) - iPhone 15 Pro.

On wifi with 6E disables on ios wifi ssid setting.

On 1.5 GB (up/down) with FTTH.

Also rebooted and clear network setting and wifi/router and all the city device as well.


Any other idea ?

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5 replies

Aug 8, 2023 11:07 PM in response to darralfromtarragindi

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



Reset Network Settings: Only network settings are removed.

  • When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile or mobile device management (MDM) are removed. Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and Ask to Join Networks settings remain turned on.
  • To remove VPN settings installed by a configuration profile, go to Settings > General > Profiles & Device Management, select the configuration profile, then tap Remove Profile. This also removes other settings and accounts provided by the profile. See Install or remove configuration profiles on iPhone in this guide.
  • To remove network settings installed by MDM, go to Settings > General > Profiles & Device Management, select the management, then tap Remove Management. This also removes other settings and certificates provided by MDM. See “Mobile device management (MDM)” in the iOS Deployment Reference.
  • Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.


If the above fails...



Reset All Settings: 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.




Mail message slow to load on iPhone.

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