Australians moving onto the National Broadband Network are now more than twice as likely to be on a 50Mbps speed plan or higher than in 2017, however low speeds are still the most popular.

The NBN Co's internal data shows an improvement in customers moving onto higher speed plans.

A major issue during the roll out of the network has been the 85 per cent of Australians choosing cheap low-speed tiers of 25Mbps or 12Mbps, but aggressive discounts on the prices charged by the NBN Co as the wholesaler has moved the dial to 64 per cent, internal data released on Monday shows.

This represents about one million Australians’ connections being upgraded to a fast speed plan.

The NBN Co reduced the cost of its 50Mbps speed plan in December to the same price as its most popular plan, 25Mbps, with retailers quickly passing on the price cut.