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Question: Mac Mail takes up too much memory and is running too slow

Mac Mail takes up too much memory and is running too slow

MacBook Pro (15-inch, Late 2016), OS is High Sierra

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Apr 23, 2018 6:51 AM in response to wkl6926 In response to wkl6926

Hello wkl6926,

Thanks for reaching out to the Apple Support Communities. I understand you'd like to reduce the space your Mac Mail app is using and improve its speed, and I have some information that may help.

Have a look at the article below for some helpful information.

Delete emails in Mail on Mac - Apple Support

If you run into any trouble, please reach out again.
​Best Regards.

Apr 23, 2018 6:51 AM

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Apr 24, 2018 9:57 AM in response to sarah_s1 In response to sarah_s1

I don't think it has anything to do with the number of emails i have (although i do have thousands in folders). One day Mail is using a couple of hundred MB storage, the next day it's using 40 GB storage. I can't use my machine anymore. The problem doesn't have anything to do w/ how many emails i've stored.

Apr 24, 2018 9:57 AM

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Apr 24, 2018 10:21 AM in response to wkl6926 In response to wkl6926

Boot into Safe Mode, Mac OS X: Starting up in Safe Mode, and run from there for a bit while checking the email issue. Any improvement? Reboot normally and check again.


Download and run Etrecheck. Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

User uploaded file

Apr 24, 2018 10:21 AM

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Apr 24, 2018 10:32 AM in response to wkl6926 In response to wkl6926

Hello wkl6926,

From what you've described, it may help to rebuild the mailboxes sing the steps below. Doing so may help clear up the discrepancies you are seeing.

If the slow performance persists or if they storage keeps fluctuating, please let us know.

Rebuild mailboxes in Mail on Mac - Apple Support

If you run into any trouble, please reach out again.
​Best Regards.

Apr 24, 2018 10:32 AM

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Question: Mac Mail takes up too much memory and is running too slow