So why have so many people started to see speed decreases of 12 to 15mb lately? I've suffered a 12 to 15mb speed decrease recently after a year of perfect stable speeds (currently being investigated by a fault manager) and so have other people across social media. It can't be a coincidence that other people across social media are suffering the same 12 to 15mb decrease. And surprise surprise the speed decrease is just above what they have to offer by law. Speed throttling going on? Cutting back other people's speeds to free up more space for new customers in an attempt to squeeze more customers in?