Comment by kjkjadksj
Tell that to apple mail. Makes no sense how an app seemingly unchanged since the tiger days when I started using it could still be as performant as it always was on far better hardware. In fact I frequently find it to be the culprit when I wonder what the hell could be spinning my fans on this m3 pro just churning over the database.
Iphone version is arguably worse because it also has performance issues but doesn’t support inbox rules. Then again those inbox rules often fail to filter emails anyhow.
I just checked mine and I have about 250k emails sitting in my personal laptop's mailbox, no issues there. It might be dependent on the provider - I know at work where we use Exchange I get occasional slowdowns but I'm not sure whether that's due to Mail.app, due to Exchange, due to our dear endpoint security software taking its sweet time checking whatever I'm doing, or any combination of these. I probably have a couple million emails in my work laptop's mailbox though. Often the "Rebuild Mailbox" function fixes any problems for me, at least for a while.
The iPhone one regularly just doesn't search properly for me though. I'll search for the exact subject or contents of a message and just won't be able to find it, then when I go to my laptop and type in the exact same terms it finds it instantly.