[soft] Spam Referrer

hi,
i want to write new soft for Spam Refferer in PHP (send Referer header), max efficiency!
that's my plan:
-scrape url's from web yahoo api [done]
-multithreading, open 100 or 1000 socket's at once, how do that ?

I use multi_curl, but curl download all page ... it's take to much time!
in response i want all headers + 10 bytes of site.

pls help or send some example

edit: or maybe do you know any download accelerator to multiple connections, where i can set:
- headers to sent
- max size download
?

in PHP i can generate list of thousands pages, and for the next step i need some rly fast soft