Scott Dorman — Windows Vista: Kernel Changes – Shadows of Reliability, Performance and Scalability
Vista makes fewer and larger disk reads for page faults and system cache read-ahead and has removed the 64KB limit. Fewer, faster, and larger disk writes for the system page file and mapped file I/O reduce the page file fragmentation and allow a larger cluster size.
The CPU usage has also been improved by providing improvements in the concurrency management within the kernel.

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