As is the default in Kubuntu, I have kmail configured as the application for mailto links. When I click on such a link, it does open kmail, and kmail seems to function normally, but the CPU is pegged. When I do a ps, I can determine that the command line is /usr/bin/kmail -qwindowtitle mailto:the.persons@emailaddress.com However if I type the same command line at the shell, it starts (sending a bunch of messages to the screen) and then behaves normally with no excessive CPU use. I should point out that I am running Kubuntu 15.10, and this is kmail2 version 5.0.2, which is not a choice in the dropdown above. Reproducible: Always Steps to Reproduce: 1. Open Firefox 2. Click a mailto link 3. Open a shell, type "top" Actual Results: 100% CPU use (on one core, presumably) Expected Results: Not a lot of CPU use.
This doesn't seem reproducible on current Plasma from master. The max it reaches over here is 8%. The command seems to have changed a bit: /usr/bin/kmail -qwindowtitle KMail mailto:the.persons@emailaddress.com If this is still reproducible for you, please reopen this bug report.