Broadband users are not getting the speeds they are paying for, according to the largest survey of its kind ever undertaken by telecoms regulator Ofcom.
Nearly one fifth of UK broadband customers on an eight Megabit per second (Mbps) connection actually receive less than 2Mbps, it found.
The research showed that less than 9% of users received more than 6Mbps.
However, the report shows that average connection speed across the UK is 4.1Mbps, up from 3.6Mbps in January.
A test like the one below can give you an indication of your current connection speed.
HOW TO TEST YOUR CONNECTION
There are many factors that can influence speed, including your broadband package, location, whether your neighbours are online, computer configuration and applications, time of day and even the weather.
Please bear in mind that your speed is likely to fluctuate over the day and this test can only give an indication of your current connection speed to the BBC site which may be affected by traffic to our servers during peak times.
Other broadband speed tests are available - see related links on the right of this page.