Load times among America's top retail sites have increased by 22% in just one year from an average 5.94 seconds in December 2011 to 7.25 seconds in December 2012.
The findings, which come from a report by Radware, are bad news for ecommerce sites considering the importance of site speed for traffic and conversions.
The data shows that the top 100 sites are actually slower than average with a median load time of 8.23 seconds, 14% slower than the overall load time of 7.25 seconds.
Top retailers are also slowing down at a faster rate than the top 2,000 sites. In the past year the load time for the median top 100 site has slumped from 6.4 seconds to 8.23 seconds, which represents a slowdown of 28% compared to 22% for the top 2,000.