Description of problem: Canceling retrieving large messages are very long when I go to another message. Demonstration video: https://docs.google.com/open?id=0B0nwzlfiB4aQRzNDYWdrSzRIb0k
Thanks for a bug report. There is filled a similar upstream bug [1], thus I'm moving this there. Please see [1] for any further updates. If possible, please CC yourself there, in case upstream developers will have additional questions. [1] https://bugzilla.gnome.org/show_bug.cgi?id=655796