Currently on 1602 so it's not that. Maybe im just being inpatient, it's pulling down the image at anywhere between 50mbps and 150mbps. I've also changed the deployment method from downloading to the local disk first then deploying to installing it straight away.
I've tried multicast once before in WDS and wasn't that keen on it. The fact that it waits for the slowest client is a pain. I can't remember where i had seen the option for 10,100,1000 mbps in sccm for deployment speeds, but if im getting 150mbps at times i'd assume ive went for the 1gbps option.