Jarmo: NWN2
is optimized poorly.
When NWN2 came out, I ran it with single core AMD 64 + 6600GS and there were slowdowns and stutters. I recently went through OC + MotB again with my current Phenom II x4 @ 3Ghz + ATI 4870, and while the performance was marginally better, it wasn't such a big difference and the performance drops are still here and there. (well ok, the resolutions are now doubled)
The game is pretty much CPU bound and not very multithreaded at all.
Good thing is, nowadays almost anything is enough to get reasonable performance out of it.
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Edit. But hey,
nothing plays NWN1 without hiccups either.
DodoGeo: Sounds like one of the ATI driver issues. I've run this game on 5 machines without problems, all nVidia GPUs and the lowest clock multicore processor of 1.7Ghz.
Three of those were were laptops which are not known for great compatibility overall.
So calling it still unoptimized sounds a bit stretched depending on your view.
You could easily blame ATI for constantly making bad drivers through the years as blaming Obsidian on making unoptimized games.
Oh and please don't confuse this with a fan boy rant, I remember well the crap nVidia pulled with a GPU melting drivers and I acknowledge ATI's superior technology through the years, but from the first Radeon card they were always held back by their drivers.
I've run it on both types of cards over the years.....it really IS that unoptimized.