Mail is Slow and lagging.

As explained higher, just delete the following file:

~/Library/Application Support/Mail/Plug-ins/Bundles/Library/Mail/Bundles/Properties.plist

To do that, in finder, go -> go to folder -> paste: "~/Library/Application Support/Mail/Plug-ins/Bundles/Library/Mail/Bundle" and next delete the appropriate file.

Except that mail is a major problem for me on Monterey and Ventura, I've had multiple crashes since updating to Monterey 12.6.1 and now also on Ventura 13.0. On both updates I was only able to open mail in safe mode. A major hurdle that even made this possible was deleting the old envelope files and going online to AOL and deleting just about all of my old messages, particularly the sent mail. Once I was able to open mail in safe mode, I could restart the machine and only open mail AFTER the restart. Waking the machine from sleep is still sluggish and it takes a while (minutes)to download new messages and open previews, and the trackpad mouse usually locks up during this process. I still cannot reopen the mail window while the machinbe restarts.

You did not mention the Mail problem of temporarily empty message fields in old messages that were previously downloaded. Do you not have that?

I must say that since updating from 12.6.1 to 13.0, my Mail has been quick and perfect.

All three of my Macs have been updated to Ventura and latest update: now at 13.0.1.

Three Macs: MacBook Air M1, Mac mini M1, 14" MacBook Pro M1 Max

All three Macs configured the same in Mail and in iCloud. No plug-ins or third-party apps. I don't like to use third party plugins, apps or utilities.

The 14" MacBook Pro M1 Max is still slow with blank Mail windows for 10s of seconds with no activity showing in the Activity window.

The MacBook Air M1 and Mac Mini M1 are perfectly fine and responsive with no delays or blank windows.

I am starting to become convinced it's something to do with OS level M1 Max process/thread handling in Mail.

My mac is a 27 inch, 2017, 3.8 Quad-Core Intel Core i5 with 16GB of memory, purchased new in 2019. The machine is very responsive with Ventura 13 so long as Apple mail is NOT open; and in response to vintage 42, I have seen temporary empty message fields in old messages tha have been downloaded. I have also seen the trackpad mouse get "jumpy" when I am working outside of mail and new messages are being downloaded. I also have monitored CPU and Memory and see nothing that indicates very high demands.

The ~/Library/Application Support/Mail/Plug-ins/Bundles/Library/Mail/Bundles/Properties.plist doesn't exist on any of my Monterey of Ventura systems. In fact ~/Library/Application Support/Mail/Plug-ins doesn't exist; perhaps because I have no Mail Plug-ins. But the slow mail rendering still occurs.

Our 2015 21.5" iMac on Monterrey had the Mail problems of slow loading and blank messages.

Our 2022 24" iMac on Ventura had no problems on Monterrey or now on Ventura.

Our 2019 13" MacBook Air had no problems on Monterrey or now on Ventura.

All running Sophos and ClamX antivirus, and CMMX utility.

Hi mail is slow and unusable on the latest update to iOS.

It has a 1-2 second lag ever time I open new email or send one.

I am using a latest version M1 laptop and this is unacceptable.

Please fix this lag.

I am relieved to have fixed this issue on my 2017 iMac (after chasing down all of the other rabbit holes). Evidently something was corrupted in my user account; this problem went away when I created a new user account and deleted my old user account. Mail, Reminders, and Calendar are now quick and responsive.

I too have had good response on the machine upgraded to Ventura. That shows something got fixed in Mail in Ventura, so now whatever that was needs to be back-ported to Monterey, since Apple supposedly supports 2 earlier OS versions. My laptop is not eligible for update to Ventura, so stuck with slow mail rendering on Monterey.

MeltingSnowtime, just to clarify, my slow mail issues started on Monterey and got worse with the last Monterey update 12.6.1. That was why I installed Ventura 13.0 (and 13.0.1 thinking Apple may have fixed something). The slow email was worse with both Ventura updates. Creating a new user account seems to have solved the problem for me, so macOS does not seem to be at fault.

After a few months of dealing with this myself I found a fix, that worked for me. I copied this from a site I found and have since lost the link to, so I apologize to the originator of this information. To perform this fix you must be comfortable accessing "hidden" files. To access items in your Library, in Finder, hold down the option key and select Library in the Go menu. Go to ~/Library/Mail folder and rename the folder to Mail.old. Go to ~/Library/Preferences, find the file named "com.apple.mail-shared.plist" and rename it to com.apple.mail-shared.plist.old". Go to ~/Library/Containers and find all the folders named "Mail" and move them into a new folder called "Mail.old". Restart your computer and fire up the mail application. Your mail system will be rebuilt and re-indexed. After a while, if everything looks okay you can delete the folders you previously renamed. If everything goes south, you can simply remove the new mail folders in those locations and replace them with the ones you previously renamed. I'm disappointed Apple hasn't taken this issue more seriously. Good luck

I have a new Mac Studio M1 Max and mail is excruciatingly slow! Seconds of lag for each character when typing a message.

The message pane takes sometimes a minute to show new mail.

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?