Windows Event Viewer records pretty much everything that happens on your system. If your system is running, if you receive random prompts or error messages, Event Viewer is a good place to start investigating. This will not tell you the problem, but it will help you identify what can happen. Each event is timestamped and a brief description usually accompanies it. A particular warning that might concern you is that the processor speed is limited by the system firmware warning.
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Processor speed is limited by system firmware
The full description of this warning looks like this;
The speed of the processor 7 of Group 0 is limited by the system firmware. The processor has been in this state of reduced performance for 203,363 seconds since the last report.
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The processor number and group number will vary from system to system, as will the period. Now anything that says a processor is limited will be alarming, but the fix is quite simple.
Set CPU Speed in Power Plan
Your power plan can, among other things, manage the power of your processor. If the value is too low, you end up with a slow processor and the warning “CPU speed is limited by system firmware”.
Right-click the battery/power icon in the system tray. Select “Power Options” from the context menu. Click “Change Plan Settings” next to the current power plan. Then click on “Change Advanced Power Settings” at the bottom. In the Power Options window, do scroll down and expand the CPU Power Management field. Make sure that the minimum CPU status on the battery and powered on is not set too low.
This speed limitation on a particular processor is a feature of Intel processor chips. This function is called SpeedStep Technology and allows the software to limit the amount of power the processor can use. The above fix is essentially a simple way to customize it. You can disable it completely if you want, but to do this you need to visit the BIOS of your system.
Go to the BIOS and search for advanced power settings, or anything else called SpeedStep, and change its status to Disabled. Save the changes and start your system.
Although you can disable the technology SpeedStep from both BIOS and Windows, we recommend that you stick to the Windows GUI to do this. It’s easier to reverse, it offers more control, and if you don’t know much about your BIOS, there’s less chance that something will happen wrong.