I have 4 identical PS4.0 servers with 4 gigs of RAM. Page file is default size of 2-4 gigs. On the heaviest loaded server, I'm seeing 3.7gigs PF usage, and on the other 3 servers with about half the load, I'm seeing 1.4-2.0gigs. Free physical memory is 1.5-2.5 gigs on the servers. Is this much PF usage normal?