How Google+ Could Cost Online Retailers Millions

One second is how long Google’s +1 plug-in drags down page load time, and that’s not “just” a second when research shows that 10 percent of site traffic is lost for every extra second a site takes to load. Facebook’s ubiquitous "Like" plug-in stalls page load time by approximately .2 seconds. This means featuring both plug-ins on a page adds c. 1.2 seconds to its load time. That translates to more than a 10 percent loss in visitors, and by extension, in conversion.