The maker of software for online retailers processed more than $1.6 billion in orders in the quarter.
The retailers led consistency tests for Internet Explorer and Firefox, respectively.
Dell.com had the best Internet Explorer consistency score among large retailers tested in September, says Compuware Gomez. Last month, the retailer had the most consistent site loading time with a variation of 0.67 seconds. QVC .com placed second in Internet Explorer tests at 0.69 seconds, followed by Apple.com (0.70), Overstock.com (0.72) and OfficeMax.com (0.91 seconds).
Apple.com posted the best Firefox consistency score in September with an average variation of 0.84 seconds, Compuware Gomez reports. OfficeMax.com trailed closely behind at 0.85 seconds, followed by Gap.com (0.94 seconds), QVC.com (0.97) and Dell.com (1.10).
The average Internet Explorer consistency score among the 19 retailers measured in September was 1.33 seconds. The same group of retailers produced an average Firefox score of 1.66 seconds.
The consistency ratings take into account differences in the speed of web page delivery across multiple visits.