Smart ResMon 
Smart ResMon lets you keep track of your CPU and RAM useage!
- displays the percentage of used CPU- and RAM- resources
- can be convienently placed in your C4D startup layout
- no more fiddling around with the taskmanager
- is completely free!
- supports C4D R10 and all newer versions for Windows-PC (32/64bit)
check out our other plugins for C4D!