It has been proven a number of times, in a number of studies that the loading speed of a website affects a user’s engagement with it and the amount of time they spend navigating it before they decide to leave and go somewhere else. With any kind of marketing it is important to grab the user’s attention and keep it. A slow site can hurt this concept very easily.

Search engines have taken note of this and have started working site speed into their algorithms, with Google announcing back in 2010 that it would be factoring it into their rankings.