Firstly, greetings everyone!
The problem might be related to the affinity of NWN to run on 1 core. Most computer processors these days come with more than 1 core, whilst NWN was developed on a single core.
Go to your NWN folder, then select nwnplayer.ini and open with notepad to edit.
Change this line under [Game Options]
Client CPU Affinity=0
to
Client CPU Affinity=-2
hit ctrl-s or the drop down file menu and select save.
If you don't have the line in your nwnplayer.ini just copy and paste the above line and save it.
In Windows 10, these are the following compatibility settings that work the best, also. You can select these by left clicking on your nwnmain.exe file, and right clicking then selecting properties. Under the compatibility tab it should look like this:
Now, if THIS doesn't work, another consideration is to download iobit driver booster (it's free), and update all your drivers.
http://www.iobit.com/en/driver-booster.phpYou can get it from this link, run the file after it's downloaded to install, then run the program. It's a fairly self-explanatory program.
If anyone has any success with any of this, let me know!