I don't see the point of concerning yourself with how the prefetch works since you cannot control its behaviour. There are a couple of discussions in the beta forum on this. Granted, the topic is macros but howards tests reveal more than just macros.

@Macros
More on @Macros

Back to the topic of protocols and provider order, build yourself a new image and leave the NetWare stuff out, and you will see the delays are no more. Then add NetWare and start tweaking. How hard can it be?
_________________________
Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.