...one in four people abandons surfing to a website if its page takes longer than four seconds to load. That's just four "Mississippis," guys. Four in 10 Americans give up accessing a mobile shopping site that won't load in just three seconds.
Amazon's calculated that a page load slowdown of just one second could cost it $1.6 billion in sales each year. Google has calculated that by slowing its search results by just four tenths of a second they could lose 8 million searches per day--meaning they'd serve up many millions fewer online adverts.