In the week leading up to England's dramatic penalty exit, after captain David Beckham went off injured and Wayne Rooney was sent off, viewer ratings for sports and gambling pages were down 20% to 83m pages viewed in the week before the tournament began.
Nielsen/NetRatings said the underperformance of the England team had led to a tail-off in sports betting as the team headed for the knock-out stages of the tournament.
Alex Burmaster, Neilsen/NetRatings European analyst, said: "The performance of England's team during the World Cup failed to live up to the hype and expectation levels of the UK online audience before the tournament began.
"Despite the tournament driving significant numbers of people online, fewer World Cup pages were viewed in the final week of England's participation in the tournament than in each of the three weeks leading up to it."
Weekly webpages viewed peaked at 106m during the week of England's second match against Trinidad & Tobago.
Nielsen/NetRatings said the three most popular sports websites of the World Cup were BBC Sport, Sky Sports and the official Fifa World Cup homepage.
In England's final week in Germany, BBC Sport returned its lowest total weekly page views with 26.7m, although it was consistently the favourite site for the duration of the tournament.
The official Fifa World Cup website had its highest total weekly page views at 6.4m, as did Sky Sports, with 5.2m.
Burmaster added: "Despite the fact that World Cup related views were significantly down in the final week of England's participation, the official Fifa World Cup site and Sky Sports both had their strongest weeks of the tournament so far in terms of total pages viewed and the number of pages viewed per visitor.
"The official World Cup site actually experienced a 58% growth in total page views compared to the average for the tournament's first three weeks."
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