Why do I need page file optimization?
Optimizing your page file when you're running low on RAM is always a good idea. When all physical RAM in a computer is in use, Windows starts using the hard disk as if it were additional RAM. This is why we have a Pagefile (also called the swap file). Because RAM memory is a lot more faster than the hard disk, whenever the computer begins to use the Pagefile to relieve memory pressure, we begin to experience a drastic performance degradation.
One of the most effective things you can do to improve performance is ensure that there is enough RAM available to avoid frequent paging (swapping) of memory contents between disk and RAM.
This means that the actual limit on the memory used by all applications is the amount of RAM installed plus the maximum size of the Pagefile.
How much swap space do you need?
That depends the amount of RAM you have and the programs you use. The rule of the thumb is 1.5 times the amount of system memory, unless you have too much load on your system.
Can the Virtual Memory be turned off on a really large machine?
Strictly speaking Virtual Memory is always in operation and cannot be ‘turned off’. What is meant by such wording is ‘set the system to use no page file space at all’.
This would waste a lot of the RAM. The reason is that when programs ask for an allocation of Virtual memory space, they may ask for a great deal more than they ever actually bring into use - the total may easily run to hundreds of megabytes. These addresses have to be assigned to somewhere by the system. If there is a page file available, the system can assign them to it - if there is not, they have to be assigned to RAM, locking it out from any actual use.
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