Hit It and Quit It: Task-Driven Net Surfers

Instead of dawdling on websites many users want simply to reach a site quickly, complete a task and leave.

Most ignore efforts to make them linger and are suspicious of promotions designed to hold their attention.

Instead, many are "hot potato" driven and just want to get a specific task completed.

Success rates measuring whether people achieve what they set out to do online are now about 75%, said Dr Nielsen. In 1999 this figure stood at 60%.

There were two reasons for this, he said.

"The designs have become better but also users have become accustomed to that interactive environment," Dr Nielsen told BBC News.

Now, when people go online they know what they want and how to do it, he said.

This makes them very resistant to highlighted promotions or other editorial choices that try to distract them.

"Web users have always been ruthless and now are even more so," said Dr Nielsen.

"People want sites to get to the point, they have very little patience," he said.