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PF Usage is an abbreviation for pagefile usage. Unfortunately the label is misleading as that is not what it is showing. This is actually the same as the commit charge. This can be more accurately thought of as potential pagefile usage: if everything in RAM that could be sent to the pagefile actually was, this is the space that would be required. A great deal of what is labeled "PF Usage" will actually be in RAM, not the pagefile. Actual pagefile usage, as shown in Performance Monitor, will typically be much lower. Memory management in modern operating systems is very complex. Do not try to read too much into what Task Manager might seem to be telling you. Chances are it does not mean what you think it does. Always remember this: Windows designers know more about memory management than you do. Windows know how it is using it's resources even if you do not. Larry Miller, Microsoft MCSA

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