The game runs fine while in full screen, but when the game is running in windowed mode, it goes incredibly fast. Sonic the chili dog eating hedgehog fast. Had the same problem with Unreal Gold, and learned during the course of getting that straightened out that it is a common problem when playing Unreal Engine 1 games on modern systems (such as Deus Ex). My UG ails were resolved after installing a patch (227 patch version i, if anyone's interested). Does anyone know of a way to address the same problem in Deus Ex?

What I've tried: VSync tweaking does not rectify issue, nor does giving the game core affinity. I've also tried compatibility options but it hasn't helped (and I didn't really expect it to, to tell you the truth). Any takers?

DXDIAG

http://pastebin.com/raw.php?i=smcjzWiP

UPDATE:

So I tried Kentie's Launcher from the sticky almost on a whim, and it didn't change anything. In fact it didn't even run at all after patching, but after installing Visual C++ 2015 runtimes, it would launch, just without changing my problem as stated. HOWEVER, after checking "Use Single CPU" within the launcher itself (configure tab), wallah. Works like a charm. Why this corrects the issue when assigning core affinity does not is above my head, but for anyone else with this problem, this seems to be the answer.

I feel like a broken record saying this over and over but this is a CPU throttling issue. Early Unreal engine games go nuts unless your CPU clock is constant. This can happen even on older single core computers if they are using motherboards with for example IntelSpeedstep that clocks up and down to save energy and put less stress on the CPU. I have heard others say that changing the energy saving settings in windows can help lock the CPU clock but that has never worked on any computer I have ever owned.

Sometimes the game will run ever so slightly too fast but not immediately noticably so. You can tell however that conversations get cut short and the characters in the world may jerk around and act strange (I mean stranger than usual because lets be honest about this game...). The game is only ever truly fixed when it renders steadily at or under 60 fps.

Any idea why setting affinity through the task manager had no effect yet assigning a single core within the patched launcher would?