Created attachment 621691 [details] Evolution backtrace Description of problem: Too high CPU load evolution and Xorg during receiving messages
Created attachment 621692 [details] Evolution screenshot
Created attachment 621703 [details] Evolution backtrace 2
Created attachment 621704 [details] Evolution backtrace 3
Created attachment 621716 [details] Evolution backtrace 4
Thanks for a bug report. I do not see from the backtrace what can request constant updates of UI, the only thing I see there is the EWS being busy with folder content update (and moving some messages into Deleted Items, or even expunging the Deleted Items folder). I also see there the contact photo request, same as in yours bug #863236, thus I'm wondering whether it has anything to do with it. Could you try to disable contact photo lookup, please? You can do that in Edit->Preferences->Mail Preferences->tab Headers, at the top "Show the photograph of sender in the message preview". The change should be taken into effect immediately, but because there will be possibly multiple requests pending already, then it'll be better to quit evolution and kill all evolution* processes.
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