I don't think there's a term called "memory loss", but you're probably thinking of a "memory leak". A memory leak is when a program grabs more memory for use while looping than it releases. This results in the machine using more and more memory over time, thus having less and less available memory to use. This causes slowdown and eventually crashing once all of the available memory has been used. When you reboot, all of that claimed memory gets released and becomes available for use again. That's why your games run faster after rebooting, the games have access to more memory after the reboot.

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