Hi. On Sun, May 26, 2019 at 11:28:43AM +0100, Paul Sutton wrote: > Is there a program that I can run to try and figure out what it is doing > ? I am sure there is but not sure what I would be looking for even with > searching. perf trace -p <thunderbird pid here> ltrace -p <thunderbird pid here> strace -p <thunderbird pid here> There are more sophisticated tools for the task, but these three are usually enough for me. Reco