Internet service provider iiNet has slashed up to four hours off its off-peak time for downloads.

The WA-based company - which has about 8 per cent of fixed-line broadband customers in Australia - has changed its broadband plans to better manage its network load, especially on weekend mornings.

Customers will, in return for less time to use off-peak quota, get a boost in the amount they can download.

In an e-mail to customers titled "Shiny plan upgrade - your broadband plan just got better", iiNet tells users they will be getting "a better deal at no extra cost".

The changes mean iiNet's popular Home 2 plan - where a landline and ADSL 2+ broadband are bundled - will see users get 10GB quota in both peak and off-peak periods, compared to 5GB peak and 7GB off-peak at present.