Amazon is growing on-demand services after reporting a 20% sales increase in 2015.
The retailers topped Internet Explorer and Firefox consistency tests, respectively, last month.
Dell.com had the best consistency score for Internet Explorer testing among large retailers tested in March, says Compuware Gomez. Last month, the retailer had the most consistent Internet Explorer site loading time with a variation of only 0.51 seconds. LLBean.com had the best Firefox consistency score at 0.59 seconds. The lower the variation, the more consistently the site loads.
LLBean.com (0.78 seconds) placed second in Internet Explorer tests. Costco.com (1.02) came in third, OfficeDepot.com finished in fourth (1.05) and Overstock.com (1.10) in fifth.
In Firefox testing, Dell.com came in second place behind LLBean.com with a deviation of 0.74 seconds. Overstock.com trailed in third place (0.76) and was followed by OfficeMax.com (0.84) and Costco.com (0.99).
The average Internet Explorer consistency score among the 22 retailers measured in March was 1.75 seconds. The same group of retailers produced an average Firefox score of 2.10 seconds.
The consistency ratings take into account differences in the speed of web page delivery across multiple visits.
Click here for the full test results.