Creator executes qmake of the current project on it's own periodically

While normaly editing code

•  - every time I save the current file
•  - and every ~5 minutes 

the creator seems to execute a qmake. It also says that it is "reading" the whole project.

The problem is, that it uses a lot of cpu power for that. The creator dose not reakt to any kind of input at that time. That realy breaks the workflow repeatedly.