The difference of a few seconds in performance usually only matters to Olympic swimmers and sprinters, but retailers hoping to capitalize on the holiday shopping blitz should be included in that group, according to recent research.

Gomez, the Web performance unit of Compuware, just issued a benchmark study comparing and ranking the mobile Web site performance of the nation's top retailers, and found that Amazon's mobile site loaded the fastest at 2.8 seconds.

The average response time for the mobile retail sites tested clocked in at 4.7 seconds -- 50 percent slower than the average response times of the retailers' traditional e-commerce sites, according to Gomez, which also found that mobile Web page load times ranged from 2.8 to 6.9 seconds.

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