Kyozo just likes to help, I believe.

Obviously, they will optimize the engine if they want to license it to other developers.

As for the patch affecting performance, currently unknown, but everything hints to "yes". Might not be something drastic, however.

I would say a large part of the weak performance is because of drivers. ATI is coming with a hotfix this week, check :
http://twitter.com/#!/catalystcreator (copy/paste it).

But yeah, CDPR will fix bugs and try to optimize the performance also.

Again, the largest performance gains in other games came from drivers.

It's not unknown..they've stated in the comments on the official site performance will be fixed.

Gotta remember this game has VERY detailed graphics and are reported to stress even some expensive cards. I suspect there were be modest performance improvements. Think the patch was primarily to fix bugs, problems with DLC/registration. AI tweaks, action optimizations and the like will probably be there but may not be the focus. Combat control issues I suspect will be high on the list as every review I've read reported issues with it. There are other ways of tweaking your machine to squeeze a few bits of CPU cycle blood from your "stone" too:

Disable all non-essential services in Windows. On Windows Vista/7 you can get a significant boost by disabling the "Superfetch" service that was originally designed to cache ALL your programs. It doesn't have any performance enhancement I've seen, quite the opposite in my experience, especially with home users. See this article:

http://www.addictivetips.com/windows-tips/disable-windows-7-superfetch/

and this:
http://windows7themes.net/windows-7-services-safe-to-disable.html

I ALWAYS disable the remote registry services. That one is not only a waste of CPU cycles, its DANGEROUS unless you are in an office with network admins. If you don't mind installing OS Patches manually after downloading them from MS, you can disable the Automatic Update service too. (otherwise it may install "priority" updates even if you tell it not it in the user interface. (reports by several net admins)

I've read that the SecuROM enbedded in the DVDs also slows frame rates (surprising) and several postings show how to incorporate the GOG binaries to get better FPS. Just for fun you could try running it with the Internet disconnected (physically). Suspect you'll see slightly better performance (I could be wrong, I just do it to be safe, not running the game till I get the patch, save installation time)

Some antiviruses use way too many CPU cycles. Among them, Macafee and Symantec are pretty bad in this regard in my experience. AVG used to be good but latest version added some bloatware in my latest test. Avira and Eset appear to keep CPU use at more reasonable levels. Not that I would recommend not running Security software, unless the PC is offline. (Cable disconnected)

The biggest boost will probably be from video driver updates. Especially with Crossfire. I wonder about the few dual GPU single cards. Friend of mine has one that few of his games could take advantage of...till now....?

Hope that helps...

Information about the patch in this interview
http://www.eurogamer.net/articles/2011-05-24-cd-projekt-defends-witcher-2-difficulty

Gop also answered one other complaint that some users have had: glitches. He explained that the development is working hard on a "huge" patch which it hopes will be available in the next few days.

"Definitely, we are aiming toward this week," he said. "I don't know if it's going to happen today or tomorrow but we will release a full changelog so everybody knows what's going to be addressed and knows what's coming.

"It's going to be a huge one and we've taken this last week really seriously and we're trying to fix if not all then most of the important things. It will definitely satisfy a huge number of gamers who are angry out there."

good. now just release it :)

Smells like a Gothic 3 to me.
I hope that CDPRED will, unlike JoWood, correct glitches!

If JoWood gave a rat's arse about Gothic 3 they wouldn't have allowed it to be released in that broken, busted and buggy state.
Even with the community patches, the game runs much, much, MUCH worse than Witcher 2 to the point that it's unplayable.

PLEASE, gothic 3. Really??
One of the worst games and publisher in the history of humanity and you compare it with tw and cdp?

Gothic 3 is a game from a different era.

Risen (which was made by the same people) turned out just fine without JoWood's "help".

True.
Such a delay (yesterday at the official website they said that the patch release is a matter of hours) indicates that there are more bugs than they originally thought. Which isn't good.
TW1 is became playable only after release of Enhanced Edition.
Sorry but that's the facts.

'Facts'? I played through and completed Witcher 1 long before they released the EE. Hardly unplayable.

No, tw1 was perfectly playable after the 1.2
And tbh I think the news on the site was referring to the "few hours of server issues" due to the upgrading, not the release of the patch.