Optimizing nutch crawl for fastest performance

Hi,

I've been testing nutch for a while now, with the purpose of
using it only
as a crawler (fetcher) of URL's. (mainly for d/l content
from pages.)
meaning that i have no need of the index/search capabilities
of nutch.

My question is, how can i optimize nutch (by configuration /
 code or
hardware ) to fetch pages with topmost speed available.

thank you.

-- 
Eyal Edri