After dropping all caches on my system, Thunderbird 102 starts in 3 seconds flat. Yes it's not lightning fast, but it's loading my office e-mails which contains 15 years of e-mails at this point.
Search is generally instantaneous on my system, including my work mails. Maybe you need to repair your index or something?
On the RAM department it's using ~750MB of memory, which is not low in any means, but considering the mail volume it's handling, it's acceptable for me.
How is 3 seconds slow? Gmail web client takes more than three seconds these days.
Thunderbird performance has never been an issue for me, except for one issue where it occasionally starts chewing CPU when syncing my monster inbox. This issue to be fair has become very rare in the last two years.
Search is generally instantaneous on my system, including my work mails. Maybe you need to repair your index or something?
On the RAM department it's using ~750MB of memory, which is not low in any means, but considering the mail volume it's handling, it's acceptable for me.