Send a ticket to tech support! Good idea to reach out here too though.

I did send a ticket to tech support, and, unfortunately, there wasn't a great deal they could do.

I asked if there was any way to slow down my computer a little bit to play the game, but they replied that while such things exist, they could damage my computer, so they couldn't recommend them.

I might be able to play the game, anyway. Not sure yet. They were able to offer a little help.

You can set the game's locked frame rate by editing the config file. It defaults to being locked at 30 fps, but you can adjust it up or down from there. Not sure if that would help your specific issue, but it might be worth a try.

I had the same problem.
Remembering this from some Unreal (version ??) engine games, like clive barker's undying, those don't do well on multi core processors.

So, as sson as the game runs, Alt+Tab / Ctrl+Tab (?) out of the game, then, in task manager, under the processes tab, setting CPU affinity of indy.exe to only one core helped for me.

But my problem is, only in WinXP it'd let me do this, not in Win7.
But my GFX drivers in winXP suck, lots of gfx glicthes there... damn ^^

*EDIT*: One has to, in Win7, hit the button "show processes of all users" on the task manager - after that, right-clicking indy.exe and then setting CPU core ffinity to only one of the cores, works. And the game runs smoothly for me.