The 42-year-old Australian singer said that it was frustrating to have to wait for singles from Aphrodite to be released, while tracks by artists like Lady Gaga and Britney Spears are available to download the minute they are first heard.
She explained to The Sun, 'I felt a little let down with my releases from Aphrodite.
'I remember doing a promo for one of the last singles and it just felt really old-fashioned.
'I'm pretty computer-savvy - something didn't feel right, but no one said anything to me.
'Then you get Britney releasing Hold It Against Me and Gaga's Born This Way available on iTunes the day you first hear it.
'That's how it should be done. And there's me waiting for a mid-week chart figure like it's 1989. I was a bit disappointed by that.'