Windows 10: Cpu going .40-.50 ghz at 20 percent cpu!

My laptop used to throttle similarly. The other symptom was the erratic fan. It returned to normal from 40 to 30 degrees on idle after blowing out the dust. When did you last clean out your laptop?

 

A more likely reason for being slow is only 4 GB of RAM, some of that is shared with Graphics which will further lower what is available for Applications, then they start swopping out to the Hard Drive which is relatively slow.

Your temperatures are a bit on the high side considering the CPU is using just 4.5 watts or so. I presume it is just a passive heatsink with no fan ?

It is a mobile series processor so they do clock down to save power when the higher clock speed is not needed.

In post #6 in fact your iGPU is close to the maximum burst frequency, it does not follow that the CPU should also go at max speed, the reverse is more likely, more power for the iGPU and less for the CPU, adhering to a strict overall power limit.

Whilst in the Power Options you can set CPU to 100% it won't go there most of the time because of strict power limits of mobile processors. If it did allow it the CPU would overheat and blowup because of minimal heatsinking in Laptops. It won't actually blowup as Intel put a thermal limit on the CPU to stop that.

 

I think i need to clean my laptop out, but how what do i use?

 

I use DataVac electric dust blower, but if that's over your budget you can use compressed air cans, which isn't as good: Why you should never blow dust out of your PC with an air compressor

It's money well invested for a dust blower over the long term because you can of course clean other items (I've been using it for years). As for how to open your laptop, you have to unscrew. I followed some instructions on YouTube. Not difficult, but can be a bit annoying.

I recommending dusting out at least twice a year.