Difficult animated gif problem.

[Valmont]

When I download an animated gif and open it, it runs slower then normal. Also when I make an animated gif in ULead Gif Animator (5) then I can never make a smooth animation (with tweening) somehow.

Look at the samples below.
After download:
[IMG]http://home.tiscali.nl/~valmont/downloadgif.cgi.gif[/IMG]
Original (follow link then choose H.Simpson):
http://www.cybernettix.vuurwerk.nl/top150.html
How come? I can't figure it out.
Another example. The moving block should move smoothly. But it doesn't.
[IMG]http://home.tiscali.nl/~valmont/blockmoving.gif[/IMG]
In preview mode, it works great...
Feel free to download this gif and observe it when opening in an animation tool, to check it out for your self.

[Valmont]

What? The simpson animation works great in here. Nevertheless, when I right-click on it and save it to my desktop and run it from there it moves slower. I need definatly technical help on that.

And still don't know why my moving little square is moving choppy. I should move smooth.