The issue is probably not with your webcam speed but with your internet conection, unless I'm misreading your question. Do you mean the recipient of the image sees a poor image, stuttering and such? Most webcams take a pretty low resolution picture that will run just fine on any modern USB port.
that could definitely be the case. if youre connecting to the ports which are on your motherboard, they're most probably usb 2.0. the usb ports on your cabinet are sometimes usb 1.0. id say its more of the first case. if youre vids are taking a long time to buffer, its the net's fault.... If im not wrong, your webcam should not be receiving any data.