MacOS – OSX able to throttle down CPU on heavy usage

I have a company macbook with a 4 core 2,8Ghz i7 (to much power for a "laptop" if you ask me, whatever). Sadly the cooler seems not to be able to handle 100% cpu usage. Sometimes filevault stresses the CPU with the process "discimages helper". Every time this happens I hear the cooler goes crazy … a few seconds later programs randomly crashes and shortly after the complete macbook freezes.

Any actions I can do to avoid too much heat on the CPU? Maybe limit discimageshelper to one core or software the holds back processes that consume to much CPU time?