can you recommend me a forum software

i need the forum can be faster than others

Well, from what I've experienced, MyBB tends to be the best and fastest (in tests) if you're going to have a normal sized forum.
- Seems like other people also have this experience: http://www.theadminzone.com/forums/showt...hp?t=42840

But if you're going to have a large (100.000+ Active users), then you might wanna check out either VB (Paid) or PHPBB (free).
From what I've experienced, they seem to be able to handle immense overload better than MyBB. But such overload only happens in extreme cases anyway, so in other words, I would recommend MyBB.

Get MyBB here: http://www.mybb.com/

I would also advise mybb, it's pretty easy to manage, it allows plugins and it can be integrated in other scripts :)
About the speed: If you are planning to get lots of users, use cloudflare and maybe Memcached or something similair (P.s. Memcached is only for when you have your own server, which I you probarly don't have.. >_>).

I think Discuz! better

another vote for mybb, ive seen some huge sites on mybb so it must be the server causing the problems on the sites you mention vanilla

I'd say MyBB too. It can handle large sites rather well, in fact. http://hackforums.net/ has nearly ten million posts :o

@Zack, congrats with the #1K post ;)

The server is of course the ultimate performance limiter when considering forum based software, but it's still worth to consider that the largest online forum right now (GAIA online w. almost 2 billion posts) is based on the PHPBB system architecture (although heavily modified, but having shared these modifications with the PHPBB community for later gradual implementation). The largest MyBB forum (It too is actually a heavily modified MyBB derivative, called NCAA Bulletin Board), which has around 5 million posts.

@Crystal, these wasn't my servers or my sites, it was a benchmark I once saw between PHPBB2 and MyBB 1.1.5, which showed that PhpBB was better at handling the mysql entries in overload situations that MyBB, but of course a lot have happened since 2006.

Anyway, basically, the speed differences between each forum software is so insignificant, that it would only matter if you ended up having millions of unique users on a laptop server, basically.

ahh yeah phpbb 2 kicked mybbs but a while ago but a lot has happened since then as you said :)

also i knew you wernt discussing your sites sorry if it seemed i thought so.

Like everyone else said, MyBB is most definitely the best. *cough*

i really love to use vbulletin is very powerfull