

Your performance issues are likely not an issue with thunderbird but with your hardware or some weird filesystem. Like others in the replies I have ten years of emails stored in my thunderbird inbox and they search near instantly.
It does not matter where the mails come from (gmail or other), if you are using thunderbird or any other client to store them locally, virtually all providers have an imap and pop3 endpoint the client connects to download everything



They should stop with that touch screen crap, always connected to the internet spyware bullshit, but they are putting that everywhere now not just EVs.
We will soon be in the siutuation where if you want an old car without that crap you can’t even go into the larger eu cities anymore, because the engine will be too polluting.
There really is a market for cars without that crap. As long as it brings me and my family to destination safely I don’t care how it is propelled.