I have been running some simple peformance testing on both OES Netware
OES Linux as most of the performance posts seem to compare NSS against

Reiser etc.

I used identical hardware for two servers
Dell 6300 servers with 1G ram and 100Mb network card
6 x 18G drives split into two logical drives
10G logical to system (sys or /)
20G logical to NSS as data
Same workstation used for both test

170M copy to OES Netware 0:26
170M copy to OES Linux 1:25

On this basis, OES Linux is not quite ready to replace a Netware fileserver just yet. Unless you want it to slow down that is.
Of course I realize that linux NSS is a 1.0 release