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Eliminate Accidentally Turning Off Turbo Mode on Turbo PCs
I occasionally run into an older PC that suddenly drops in performance dramatically; suddenly, one day, the system is running at a fraction of its previous speed. There are many possible causes for this problem, but one annoying cause is accidentally disabling turbo mode on a PC that uses it. Many older 286, 386 and 486 machines have a turbo button on them. When enabled, "turbo" actually allows the system to run at its intended full speed; when disabled, the PC slows down.
Today, newer PCs don't generally bother with this; some cases still have the button but it won't generally do anything. Even older PCs rarely have any use for this feature. You can disabled the turbo button if you aren't using it, or if you keep disabling turbo by accident, fairly easily: