And Three is hailed as the best operator in the UK capital for browsing and texts.
London has Buckingham Palace and New York has the Empire State Building, but network performance analyst RootMetrics says there's no comparison for mobile web speeds in the two cities.
More than 16,000 ground tests showed that connections in the Big Apple are an average of four times faster at 8.5Mbps, falling to just 2.27 for London.
The results show that browsing speeds in the UK are hugely disjointed, with O2 powering high speeds of 12.5Mbps in Chingford Mount, rather than the centre of London.
Meanwhile, Three is hailed as the best overall network speed in terms of internet and texts, even clocking up 7.3Mbps for the village of Snodland in Kent.
O2 ranked as the second best, Vodafone was third, and Orange and T-Mobile brought up the rear in fourth and fifth suggesting Everything Everywhere's service leaves much to be desired.
Bill Moore, CEO and president, RootMetrics, said: "With mobile internet use soaring, having a fast, reliable data connection has become as important as having a consistent mobile signal.
"It’s quite amazing to find such a vast disparity in services between two cities that are rival destinations for global business and tourism."