Difference in speed over a short distance
I am buying a property. The property is one of about 40 others in a small area, with less than a mile from the first to last property. All the properties have AT&T Internet. The first 15 or so properties have 10Mb internet, but the remaining 25 have less than 768Kbps.
How is there such a huge difference in speed in such a short area over the same copper wire?