This article details the process for running a diagnostic on your processor when you are experiencing slow performance.
You can run diagnostics on the Processor via the Intel Processor Diagnostic Tool.
From the above link download Intel Processor Diagnostic Tool, run the file and make sure internet is connected as it downloads components which are required to run the test.
The test will usually take a few minutes depending on the successful download of all components.
While running the test you will find the below screen:
Once the test passes you will find the screen as below: