I am sorry to hear you are having issues but let me help you.
The clock speed of the processor you have is 2.4GHz and it can go up to 3.4GHz when it is needed. However, in mobile technology it can down clock the speed up to 1GHz depending on the workload (background services, running programs, etc).
This is possible based on internal algorithms in the processor to manage power in mobile products. Also, it is important to mention that the processor can increase the speed depending on the factors mentioned before.
We have a tool called Intel® Processor Diagnostic Tool that diagnoses the internal components on the processor and if it has something bad will be displayed on the results.
I recommend you running this application that can be downloaded at the following link:
Win 8.1 32 Bit:
Win 8.1 64 Bit:
Besides running this application, you can try with a BIOS update from the manufacture.