Hi Guido,
I could easily find several similar topics based on the keywords “CPU” “usage”
http://forum.renoise…ws-task-manager
http://forum.renoise…ystem-linux-x64
http://forum.renoise…ays-fully-used/
http://forum.renoise…repancy-on-osx/
http://forum.renoise…-usage-measure/
http://forum.renoise…-and-cpu-usage/
Most important topic to read:
http://forum.renoise…-multicore-faq/