Avisynth slow

[afantos]

I am very new to avisynth, I just maneged to make it work with Virtual dub and is conciderable slower than before,
here are the lines I wrote

LoadPlugin ("C:\Video Compressing Tools\AviSynth2\plugins\MPEG2DEC.DLL")
mpeg2source("c:\xxxx\video_ts\xxxx.d2v")
Crop(0,10,720,460)
LoadPlugin ("C:\Video Compressing Tools\AviSynth2\plugins\Convolution3d.DLL")
Convolution3D (0, 3, 4, 3, 4, 2.8, 0)

I only get 6-8 ftp on my Athlon xp with vdub at fast recompress and selected YUV 4:2:2 at DVD2AVI
what's wrong?tnx

ps when I open the file with media player it plays very slow, (slower than vfapi)
I use version 2.06

[JohnMK]

Convolution3d is the culprit.