How much are you sliding? Can you post a screenshot or something similar? It's just that I (like the millions who bought this game) am also experiencing speed issues -I know about the fix- and I've only tried the in-game settings. Still, the game runs remarkably different (on both machines I happen to own) than those vids, in terms of "fluidity", even when the bar is only at "10%".
Sorry for the delayed reply.
I find the slider can be very sensitive.
I don't notice much difference between:
- Slow Mode with a fuller bar
- Fast Made with 3/4 bar
So experiment and see what you like! =D
I've settled on these settings - the units move around at a normal
walking pace. (a bit like Age of Empires units)