Adding half a second to a search results page can decrease traffic and ad revenues by 20 percent, says a Google study. For every additional 100 milliseconds of load time, sales decrease by 1 percent, Amazon finds. Users expect pages to load in two seconds—and after three seconds, up to 40 percent will simply leave.
If you are experiencing slow load times, there are enhancements that can be made to assist in load times. Bottlenecks could be images that are too large, bad javascript that causes a web page to hang, or in some cases it could be the hosting provider causing the slow load times. (Although rare- it does happen)