> If you're compiling firefox on the same single disk that stores your mail, mu4e is going to take multiple seconds just to go to the next thread. I don't know

> If you're compiling firefox on the same single disk that stores your mail, mu4e is going to take multiple seconds just to go to the next thread. I don't know what kind of machine you're using, but that's not true for any CPU/disk from the last 8 years or so.