I am constantly struggling with (1) GMail acct emails in my MacMail account. Never loads all of the emails or takes forever. I have no issues with other GMail accts...MacBook Pro 2023 Sonoma 14.5

Sy Creed wrote:

I have replicated all my other Gmail settings and still have issues.

https://discussions.apple.com/content/attachment/f392f36b-7bc5-4f09-ac84-9a3554d6535b

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

ref: Set up Gmail with a third-party email client - Google Help

How to set up Gmail with Apple Mail