I possibly have this issue as well. however, after letting thunderbird run for 18 hours (!) of cpu time the cpu usage dropped to reasonable levels. after exiting and restarting thunderbird the usage goes up again for some minutes but then normalizes much faster...
I possibly have this issue as well. however, after letting thunderbird run for 18 hours (!) of cpu time the cpu usage dropped to reasonable levels. after exiting and restarting thunderbird the usage goes up again for some minutes but then normalizes much faster...