I am definitely seeing an improvement in modest email. Freezing and crashing problems from the 1.3 release have gone away. I think that these were affecting the whole system--causing some general sluggishness and freezing things briefly when a new email came in. Responsiveness is back to the right-after-flash levels, even though no flash was involved in this upgrade. So I am guessing some memory leaks or runaway processes may have been cleared up in modest.

I am only about 36 hours into running with this upgrade (with no reboot) and I have not seen any performance or email issues at all. I'll keep looking for problems for the next few days, but kudos to the SSU team!