What does the Camera Slow Down?

[Geek 2.0]

I've heard from a few people now that the camera slows down the dashboard. However, I'm not exactly sure what, how, or why it slows down. So...

If the dashboard slows down, is it only the dashboard? (For instance, the dashboard does update as frequently, but the robot still responds the same)

If the robot slows down, why and how? Is there a way around this?

Is the problem because people are sending the image to the dashboard? What if we don't do this?

I think you can get the general idea of what I'm looking for. We're trying to decide if the camera is worth the time/effort.