The Page File Transfers chart shows recent Windows paging activity. It shows the number of disk reads per second to and from the page files. Paging occurs when the Windows Virtual Memory Manager moves data or code between physical memory and disk. Sustained high paging rates can degrade system performance significantly.
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Page reads

Shows the number of times the disk was read to resolve hard page faults.

Page writes

Shows the number of times pages were written to disk to free up space in physical memory.