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termit: Believe it or not, it may be sound related - I've had the same issue for years and tried various workarounds that did not work, so in the end I just stopped playing the game. Recently I found a suggestion to try and enable hardware sound - and suddenly I have a steady nice framerate with the game at highest graphic settings.
THX,verymuch!~~
According to the Bioware Social Site's Support Self-Help Forum for NWN, the latest (October 2011) nVidia and ATI drivers both address the low-FPS issues people have been experiencing with both NWN and other openGL games.

If you are still having low FPS after installing the latest driver, many users have found that turning OFF threaded optimization (at least for nVidia cards) improves the FPS.
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Pstemarie: If you are still having low FPS after installing the latest driver, many users have found that turning OFF threaded optimization (at least for nVidia cards) improves the FPS.
And how to do it in ATI cards? I have the newest drivers and this option is nowhere to be found.
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Pstemarie: If you are still having low FPS after installing the latest driver, many users have found that turning OFF threaded optimization (at least for nVidia cards) improves the FPS.
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Arthandas: And how to do it in ATI cards? I have the newest drivers and this option is nowhere to be found.
I believe ATI calls it "dual core optimization"
I have ati and I can;t find that option on mine. As the BSN installation sticky that pstmarie suggested before says, play with the settings for the catalyst AI. You'll need to be in advanced view iirc. More details in the sticky.

Installing NWN1 for Win7/vista including patch links for all OS

The Ultimate link list sticky on this forum has lots of useful links ;)