Searching sucks but with Tahoe it has improved. It's funny - apples super old email client Cyberdog from the 90s had better search.

We built a cross-platform offline-first IMAP client:

https://marcoapp.io

Search is single-digit ms. All metadata stored on the client.

I built this over the course of a year, literally driven by my frustration with Apple Mail. Maybe give it a try!

Edit: Also, extremely brave of you to upgrade to Tahoe. No chance for me

What framework or frameworks?

> All metadata stored on the client.

Passwords, tokens, and attachments stored on your servers according to your privacy policy. And headers, message bodies, drafts, contacts, and flags if encrypted server cache meant what it sounded like. And telemetry with no choice mentioned.

It does but honestly less than those cloyingly glossy and sluggish Electron/hybrid apps out there. So it's not like we users are spoilt for choice.

Curious, which particular ones have you tried and hated?