Around 6.2 million Aussies admit they have no idea how well their superannuation fund is performing, a new survey has revealed.

Up to 29 per cent of Aussies said they didn't actively monitor their super fund, according to a study of over 1000 people by Finder.

A further 16 per cent said they did, but were unhappy with how it was performing.

Experts are now warning this complacent attitude could cost Aussies thousands when it comes time to retire.

"The difference between an average fund and a top-performing fund can be the difference between just scraping by in retirement and living comfortably," Alison Banney from Finder said.

"This ignorance could cost you tens of thousands of dollars come retirement due to reduced returns.

"If you're not monitoring your super's performance, you cou

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