When you are trying to make visitors stay who have attention spans less than that of a squirrel, time is of essence. No one likes to wait and watch as your slow webpages unfold tediously in front of your visitors. Sites that load in less than 5 seconds see 70% longer average sessions. This does not mean you cannot make your websites faster than that, but if your site comes under 5 seconds then you can cash in on those extra minutes.
If you have already tried front-end performance fixes and you further want to tweak your site for better