January 29, 2014, 9:23 AM

Apple and Costco top December consistency tests

Apple led Internet Explorer tests and tied with Costco for the Firefox lead.

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Apple.com had the best consistency score for Internet Explorer testing among large retailers tested in December, says Compuware. Last month, the retailer had the most consistent Internet Explorer site loading time with a variation of only 0.29 seconds. Apple tied with Costco.com for the best Firefox consistency score at 0.28 seconds. The lower the variation, the more consistently the site loads.

Costco.com (0.43 seconds) placed second in Internet Explorer tests. Dell.com (0.68) came in third, Amway.com finished in fourth (0.98) and LLBean.com (1.14) came in fifth.

In Firefox testing, Dell.com came in third place behind Apple and Costco with a deviation of 0.62 seconds. Amway.com trailed in fourth place (0.95), and was followed by Overstock.com (1.10).

The average Internet Explorer consistency score among the 22 retailers measured in November was 1.61 seconds. The same group of retailers produced an average Firefox score of 1.77 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.

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