Syncing whole catalogue back from Cloudy to new Catalogue in Classic-very slow - Adobe server speed?

So having used Classic for many years, I moved to Cloudy 6 months back - I asked on the forum how I get to use Classic again (so I can print & other things), and was recommended to back download my 69,000 images to Classic via the sync option in Classic - so I started that weeks ago (before going away) - slow - rang BT - they said my router wasnt as fast as it should be - so they sent me a new one (exactly same model!) - no different - at the moment it is syncing between 80 - 400 images per hour - I calculate that could take 2 weeks or more for the whole catalogue (average image 17MB, download speed 48Mb/sec > 17/((48/8)=2.8 seconds per image or ~1270 images per hour) - does that mean something wrong with BT or could it be Adobes servers being slow? Today it is down to 50 - 85 images per hour - will take a whole month!