A survey suggests online Christmas shopping peaked well before the big day.
Keynote Systems, which measures internet use, says shopping websites were busiest between November 27 and December 11.
Websites like Amazon and Toys R Us were much slower to download during this period than afterwards.
Keynote Systems says Amazon took an average 10.79 seconds to download until December 4. By the final shopping week it took just 3.5 seconds.
This was true of other online stores including Toys R Us, Debenhams and Comet.
John Lewis was consistent throughout the pre-Christmas period, taking one second or less to access, the survey says.
A Keynote spokesman says the lack of online shopping near Christmas may show people were concerned about getting gifts delivered in time.
Olivier Carron, vice-president of Keynote Europe, says: "Early research indicates Christmas saw online sales of £815m, twice as good as last year.
"In the light of this massive increase in sales, the performance of the UK's popular ecommerce sites has been good. It is telling, however, that the public appears to have learned from earlier years and planned well ahead when buying gifts online."