When I move the cursor inside the window while having other things going on ( animation, sprite movement ), everything goes much faster. I haven't limited frame rate yet, though when I attempted to I got no change in result. My problem is exactly like the person who created this thread:
http://www.dreamincode.net/forums/topic/241952-sfml-speedup-with-mouse-movement/The Youtube video he provides has the exact same problem, and his code is structured just like mine. If my code needs to be shown, I can, though I see no difference in the design we both have.
I'm using SFML 1.6 ( stable ), compiling in Visual Studio 2008 ( C++ ).