After Installing Wordpress the next most prior step is to use some optimization plugins which gives Your Wordpress Site a Boost of Speed. W3 Total Cache is worlds most popular plugins to achieve best optimize pages of wordpress and serve it very fast.
But W3Total Cache Plugins has hundreds of setting which needs some experts to configure. If you have made a mistake in setting of minify order of JS Files it will take more long time to load. There must follow load sequence in which the resources are getting accessed. MINIFY, CAHING, DATABASE CACHE, BROWSER CAHE, EXPIRY HEADER all this fields has lot other setting which needs special configuration related to your Hosting Environment, Structure layout of your theme and number of resources.