Visitors are less likely to return to a site that is even 250 milliseconds slower than a competing site.
That’s according to Harry Shum, a Microsoft executive who leads research and development efforts in search for the company’s Bing search engine.
That’s an increment of time equal to about half the amount of time it takes a human to blink. This sentiment that milliseconds matter has been repeatedly echoed by Google scientists and other leading web performance experts.
