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Another way that application performance benefits from caching is by buffering writes in memory and deferring the update of the physical disk. If this occurs before the write is flushed from cache to disk, it is no longer necessary to perform the original write.
Having been deferred, there is now an I/O operation that no longer needs to occur at all, resulting in a net savings.
This helps the responsiveness of foreground applications like Microsoft Word because the Windows 2000 Cache Manager automatically reads ahead in the file being opened.