I know this is a common problem with games using the older unreal engines, but everything I have looked up as far as fixes to this "slow mo" problem only apply to games like Unreal, Rune and Deus Ex.

Ive tryed everything, setting affinity, compat mode, everything I can think of even turned off the "speedstep". The game still runs in and out of a slow motion. I fixed it with the above games by running them with a glide wrapper, but i havnt found a way to change what renderer xiii uses if you can even change it at all.

Any help would be appreciated, thanks.

Hi,

did your trials also cover to set the energy settings to maximum (especially on notebooks)? Some users reported this as a possible solution.

Take a time to clean up the running processes via task manager to a minimum number before launching the game to see, if there's not some guy in the background still influencing the game in a bad way.

Good Luck.

Has anyone figured this out in any degree? I want the game, but I'm having this problem with the demo, and it's really frustrating.

Worst case scenario, I'm sure it would work in Windows XP Mode. Or would it? Is anyone NOT having this problem?

I had it with Undying, too--another old Unreal Engine game.

EDIT: OH GAWD I FORGOT HOW USELESS WINDOWS XP MODE IS. Someone smack me.

found a fix! sorry for thread-reviving.

first, open up the xiii.ini and disable vsync.
then, download this: http://coding.hanfling.de/launch/release/Launch-UnrealTournament436-1.0.zip
unzip the Launcher.int to your system directory and REPLACE Xiii.int
????
Profit!