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Apple Mail LAGS after OS 27 update

Anyone having issues with lag in Apple Mail following the update to OS 27?


My computer:

2021 M1 iMac, 16 GB, Apple Mail - V16


Yesterday, I updated the OS to 27. I immediately noticed that Apple Mail lags badly. It takes forever for messages to load, attachments to appear. Even the responsiveness to typing anywhere is terribly laggy. It's basically unusable for me at this stage.


I've tried to rebuild. Force quit. Restart. The problem persists.


Suggestions to get it back to normal? I've resorted to use Thunderbird in the meantime.


Thank you.

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