Mail very slow after OS update 15.1.1

facky-23 wrote:

Mail has become very slow for me after recently updating my MBP to Sequoia 15.1.1 and my iPhone 15 & iPad mini to IOS 18.1.1.

It's taking forever to download, copy emails, sync between devices.

I tried rebuilding my mailbox and even removed/added back my gmail account, but neither improved the situation. I'm having a similar experience across multiple Internet connections and it started after the update.

If anyone has a remedy I would really appreciate your assistance. Thank you!

sign out of iCloud/AppleID and back in again

Sign in to or out of your Apple Account on Mac

facky-23 wrote:

I signed out of my Apple ID/iCloud, but it did not resolve the issue. It's still taking a long time to download emails, load content, etc.

Sign out and back in.

—Have you shut down and restarted more than once since your "OS update 15.1.1"...

—You can quit Mail and relaunch it holding the Shift key down and compare your results.

—A SafeBoot Start up your Mac in safe mode - Apple Support will sort many anomalies

Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled temporarily.

For problem accounts the go to way to sort things out is to delete the account(s) from the Mail.app, then add it back.

Remove email accounts in Mail on Mac

Remove email accounts in Mail on Mac - Apple Support

Add email accounts in Mail on Mac - Apple Support

Add email accounts in Mail on Mac - Apple Support

Note—

IMAP accounts stay on the server, so no local loss, when you re-sync

POP accounts download and remove from the server—therefor save your inbox/sent box if you want them

“On My Mac" is just that, local folders you created and moved mail into. So no loss

Login and test. Reboot  as normal and test.  Caches get rebuilt automatically.

no insight or resolve–

Call Customer Support  (800) MY–APPLE (800–692–7753)

or on line  https://getsupport.apple.com/

or call  AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple for support and service - Apple Support