I wouldn't recommend running most "memory manager" applications in "Free" mode while operating critical applications or while involved in time-sensitive applications (such as games).
the memory free process usually requires the program to go through and attempt to have the program free all of its unused memory. This can also result in the memory being paged rather than being freed. In any case, this can actually cause a very large lag spike while the process is taking place. I'd recommend finding a nice safe spot before attempting to run any sort of "free memory" on the system.
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