Lagged animation

I have rendered a simple scene in Blender Internal, 2000x1500 pixel, but the video is very lagged. I don’t know what factors may cause this.
What values I must change for make the video smooth?


We don’t know your encoding settings
How are you playing back the video, try another application
Is your computer too rubbish to play video ?

We don’t know the answers to these questions because you didn’t supply the info or a link to a video sample or source blend

Sorry, I though that you could know what is wrong only seen the render settings.
This is the blend:
http://www.pasteall.org/blend/33995
I don´t think that is a computer problem, I already rendered videos and it worked well.

Note: I use Windows media player. Maybe the problemis in the video format.