High cpu usage when working in QT Creator

got the same issue and looked at forums however did not see it resolved and i think its a real bug.

Preqs: use qtcreator for some time with Clang plugin. 

issue: system monitor shows a 25% usage by the qtcreator process. this happens randomly when you use or not the editor (it just opened). high cpu usage continues during 2 minutes plus and eventually go away or not. the longest time i remember was a couple of hours when no activity was done in the editor.

steps to reproduce: 

– have qtcreator opened for a while (clang plugin must be loaded)

– when high cpu usage is started, close the ide 

– open again with default params (clang plugin is on) -> high cpu usage continues

– close and start the ide from terminal without Clang plugin loaded (screen 2) -> cpu usage is ok

– close and start the ide again with default params -> high cpu usage comes back again and continues for some time 

can do that forever. 

attached 2 process dumps when cpu is high and one after it resolved by itself.

tried with clang versions 5 and 6. 

qt-creator is built with clang, git and webtools only.

i think its correct to say that as longer you do not close qtcreator as longer the time periods with high cpu load continue.