Not sure about the theoretical case but here's some stats from a system of heavily tuned Apache web servers running Linux 2.0 (NFS V2) mounting a NetApp for all content. It's only serving plain content - no scripts.

Average NFS operations per url is 7.96.

getattr 31867993 10% lookup 142423109 45% read 145310674 45% readdir 58359 0% statfs 30 0%

File size breakdown: Percent File Sizes 0.000 0 0.000 1b- 10b 0.001 11b- 100b 0.172 101b- 1kb 7.633 1kb- 10kb 19.897 10kb-100kb 10.331 100kb- 1Mb 61.822 1Mb- 10Mb 0.145 10Mb-100Mb

Steve Clarke