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Key graf:
Walmart's median load time was reported at around 4 seconds, meaning half of their visitors loaded Walmart.com faster than 4 seconds and the other half took longer than 4 seconds to load. Using this knowledge, Walmart was prepared to act. By reducing page load times by even one second, Walmart found that they would increase conversions by up to 2%.
Now, "up to 2%" is a fishy sounding number, but even a slight conversion improvement on their volume is a big number.