B&W instead of RGB for optimization?

this might be a very newbie question but nevertheless.

I was wondering if making my jit.window b&w instead of RGB is better for optimization?

I already have my jit.grab @unique 1 @colormode uyvy
and a slab to video plane with the cc.uyvy2rgba.lite.jxs

that helps

but since I don't need color I am wondering if there is another way that might optimize my patch even more.

thanks