Just over 2,000 adults in Britain were interviewed for the report by Which? Online.
The study found almost 19 million people in the UK – four in 10 adults – were now online, with men making up just over half of all users.
But despite this, the number of people venturing into cyberspace has slowed down.
Numbers online grew by just 11% over the past 12 months compared with 33% the previous year.
There remains a clear demand for high-speed access, with 27% of people saying speed is one factor they would like improved. Yet only 13% have taken up any form of high-speed access.