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Memory management and cache usage
With Vista, Microsoft introduced a new technology called SuperFetch for caching applications and speeding up boot times.
Microsoft indicated in a blog entry in May that Windows 7 would disable SuperFetch on systems using SSDs. The company also said that other features such as Defrag and ReadyBoost would not be used under Windows 7. However, in the RTM version (7600.16385), only Defrag is in fact inactive for SSDs.
The SuperFetch feature in Windows 7 differs significantly in approach and cache usage from its counterpart in Vista. Under Vista, the caching of applications starts immediately at launch. As the graph below shows, after three minutes just over 1GB of memory has been allocated. In Windows 7, SuperFetch starts after five minutes and after 10 minutes a little more than 600MB has been allocated. By that point, Vista’s SuperFetch has allocated more than 1.5GB.

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