When I was using Thunderbird on Windows back years ago, i abandoned it in a week because it was absolutely slow when fed with years of archives as compared to Outlook 2010. Seeing recs for Thunderbird recently says something for sure.
replyApparently, they did a rework of the interface a few years ago.
replyhttps://github.com/thunderbird/developer-docs/blob/master/th... and https://blog.thunderbird.net/2023/02/the-future-of-thunderbi...
I don't even think Thunderbird has gotten any significant speed improvements over the years (unlike Firefox). The only real reason it's gotten better on that front is that processors and I/O have gotten faster. Meanwhile, Outlook as managed to take every morsel of improved hardware, and squandered it.
replyI've never had problems with Thunderbird on that front, but then again, I've never had email accounts with 100k emails archived.
I really like Betterbird. It's basically ESR Thunderbird + a few fixes.
replyIf you want mail to just work and updates going smoothly it's the solution.