Video Input Delay on DL2??

I am finally able to add a DL2 to a rig I am working with.

I was going to send my live video sources using RGBHV but realized that I am projecting on a circular screen and need the graphics engine to apply my matte.

I am going to convert my system to run my live sources over S-Video but will there be a time delay?

I know there is potential for some delay through my system, but I am used to "normal" delay using my current system.

Will there be additional delay if this is the only signal running on the DL2 and it is running straight to the projector with only a matte being applied... no effects.

Thanks!