Lag and big size of my clip

Well, program can't show every single frame and it is normal that file size is so large.

ehm oddi , you cant expect it to be good after you have taken it out from virtualdub . you must do a final render in Sony vegas etc .

Its normal, that it's laggy, because it's an uncompressed .avi-file. ;]
When you're playing your clip, check out the fps (should be able to see) :P
With your "final rendering" (eg. with Sony Vegas) you get a smooth file (if you used enough frames and good settings :P) with a smaller filesize ;]

If you can rendering an .avi-file with Windows MovieMaker, I'm not sure.
If I find sth. about it, I will tell it here.

EDIT: Maybe this can be useful for you, but am' not sure. :P
Direct Stream: http://www.5min.com/Video/How-to-Render-High-Quality-Video-with-Movie-Maker-22799957

Originally posted by Oddi^

Hey! So the thing is that when I use the startmovie something 90, it gets the pictures, I make it into a .AVI with VirtualDub. Now it has like 700mb filesize and it's very laggy. Is there any way to fix that? I cannot use fraps or anything like those because it makes my fps 20 and the movie comes very laggy. I have only seen guides for Sony Vegas. I am using Windows MovieMaker. Thanks in advance!