Alpha channel is making my video drop frames ,or move very slow.

tsiwt's icon

I have a pdf that is black and white that I am putting in top of a video passing it through an alpha channel to take the white away from the pdf.
the main problem is that this process makes my video run extra slow, i tried the colormode uyvy , videoplane amongst other things and none seem to work...

here is the patch.

thanks in advance

Max Patch
Copy patch and select New From Clipboard in Max.