Paillote: When clock modulation throttling is being used, it slows the CPU down internally. A CPU performing at the equivalent of 200 MHz is going to have to work a lot harder than the same CPU when it is allowed to run at its full rated speed of 2000 MHz. The Task Manager percent will go up as the CPU needs to work harder.
The log file Idene sent me shows the random use of multiplier and clock modulation throttling that has nothing to do with core temperature or CPU load. That's a bug in the bios and your E6410 might have a similar bug. Does your laptop use the Intel graphics?
ThrottleStop is a low stress program so you can leave it running and minimized in your system tray without it bogging down your CPU. Turn on the log file option and just run it in monitoring mode so the next time you experience a slow down, you will have a full record of exactly what happened. It keeps the multiplier throttling separate from the two main types of clock modulation throttling and will also track your CPU core temperature to make sure that is not the cause of the problem. It usually isn't. If you're not sure how to interpret the data in the log file then send it my way and I'll have a look at it or upload it to
MediaFire and post a link here.