HP Probook 4510s CPU speed...

[7tech]

Hello,
I have a HP Probook 4510s which has a good level of speed.
Using the windows 7 desktop gadget tool i found that normal the CPU is running at 1-35% depending on what i am doing, and when the laptops comes out of stand by the CPU normal is around 35% and then goes down to about 11% until i start to work on the machine when it changes to accommodate the task in hand...
However...
Over the last couple of day the CPU has been running fine until i start using the laptop after it been in stand by... At the moment when i bring the system out of stand by the CPU jumps straight to 100% and the system is no longer capable of running simple tasks, the only solution is to re-start the laptop and then the CPU returns to normal, until stand by, when the same happens again...
Why does this happen?
Why has it not happened before?
How do i fix it?
Thanks

 

[cluberti]

Using xperf from the performance toolkit is probably your best bet. There's an MSDN blog post (with video tutorial) on how to do this specifically (the only problem is the command Tate runs in the cmd prompt is a little hard to read - it's "xperf -on latency -stackwalk Profile").