Try the following.
1) Defrag Your HDD
2) Update your Video Drivers
3) Set Your NWN cache to a fixed amount of memory. Add this line to your NWNplayer.ini file under [Game Options]
Max Memory Usage=30
This allows you to set the amount of available memory (in Megs) that the game will use for caching resources in memory. Adding more memory for the cache may improve performance up to a point, after which increasing the cache size any more most likely wont do much. Your mileage may vary.
Hope this helps.
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