Purchased and getting awful stuttering...Ideas?
Three possible solutions exist:
1) Rebooting your PC ( source
2) Download and install NWN2 Client Extension
3) Download and install this fix
The first solution has a minimal impact, but it might not work and it's not definitive.
The second solution is the most invasive, but should fix the stuttering issue and should even improve the game experience and fix various bugs.
The third solution is less invasive than the previous one, because it installs a single DLL library into the game directory, however this should be enough to fix the stuttering issue and nothing else.