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Processor Power Management
A Windows setting which can sometimes artificially limit your CPU's performance
This article is specific to Windows Operating Systems and does not have a clear macOS analogue.
Change the Windows Power Plan
Search Windows for Edit power plan.
When the Control Panel item with that name appears, click on it.
Click on Change advanced power settings.
Find the Processor power management entry.
You may need to click on it one or two times to expand it.
Set the Maximum processor state setting to 100%.
Set the Minimum processor state setting to 100%.
If playing on a laptop, you may wish to revert this setting after testing, as it will drain your battery more quickly.