None of my complaints stem from that. I've never played Splinter Cell and I don't really have a reason to think this is from what I've seen of it.
Also, a lot of the times I've had trouble speed had very little to do with it. Unless by slow down you mean stop, line everything up perfectly, and then make the jump.
No, I mean stop sprinting at full speed across the rooftops.
You hold the right trigger, you run. You hold the A button, you sprint, and gain the ability to leap and free run, which results in a loss of accuracy.
The beautiful thing about AC's control system is that it's remarkably simple, but offers a lot of depth. I get running around, but the only time I ever had any problems like what you're describing came when I was holding the A button down constantly.
I last played Dragon Age: Origins.
Finally making some progress again, after putting it down for months. Hopefully, I can beat it this time. O.o