How fast are internet speeds? And why aren’t my speeds consistent when using different websites or internet services - and at different times of the day? Well, this is like asking how fast you'll go if you had a Ferrari. Fast, right? But in reality it will depend on the speed limit of the road you’re travelling on and traffic conditions. Like roads, our networks have different speed limits - some being much faster than others - and all are dictated by factors meaning you may experience slower speeds than the maximum, most of the time. NETWORK "SPEED LIMITS" Technology Speed Limit What stops you experiencing these speeds? Download Upload Specific to a technology All technologies ADSL (ULL) 20 Mbps 820 Kbps* With ADSL there is no simple answer for speed. It starts at 20 Mbps download but gets much slower the further you live from an exchange