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Atlantico: I played it on Windows 8.1 and it was completely smooth. I've voiced my criticisms about this game in other threads, but stuttering wasn't among them.

This on a modern tower, multicore CPU, real GPU, etc. Jade Empire runs smoothly on a modern machine with the latest Windows OS.
Thanks for sharing, I have a similar system (probably less powerful than yours) so this is helpful; saves me the trouble of posting a thread to ask if Win 8 players had problems.
Rebooting worked for me.
I think Jade Empire uses the same engine as NWN and NWN also has this problem. What I read about it is that the engine uses something with your CPU's clock to do timing calculations, but if your computer has been running for several days, the number it's looking at is very large and causes calculation errors. There's loader for NWN that fixes this, but I haven't seen anything for JE. Rebooting really is the best way to fix it.

Edit: Actually, I think it's NWN2 that has this issue.
Post edited May 10, 2015 by Kaylakaze
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andyf: Well, Konrad from gog has been very helpful and managed to resolve the issue for me, eventually by following this advice.
FYI the link above is dead. This is a working link
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Kaylakaze: I think Jade Empire uses the same engine as NWN and NWN also has this problem. What I read about it is that the engine uses something with your CPU's clock to do timing calculations, but if your computer has been running for several days, the number it's looking at is very large and causes calculation errors. There's loader for NWN that fixes this, but I haven't seen anything for JE. Rebooting really is the best way to fix it.

Edit: Actually, I think it's NWN2 that has this issue.
This appears to be true. That's why a clean boot works, with the other fixes applied.

Windows 8 does a hybrid hibernate/shutdown when you tell it to shut down, which doesn't reset the uptime timer. To work around this issue, restart your computer by typing this into CMD (Find it by searching for cmd in the start menu):

shutdown -r -t 0

It will instantly restart your machine by actually shutting it down, rather than hibernating. This resolved the issue for me.
Solved by fk.
https://www.gog.com/forum/jade_empire_special_edition/stuttering_fix
I've tried that solution, and while it does solve the stuttering problem for me it creates a new problem where when you quit the game the screen goes black and the PC locks up, requiring a hard reboot. Any advice? (to get the new dll file to work I have to take the exe file out of compatibility mode)