// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require foundation
//= require turbolinks
//= require_tree
//= require d3

$(function(){ $(document).foundation(); });

var loader = document.getElementById('loader');

startLoading();
function startLoading() {
  loader.className = '';
}
function finishedLoading() {	
  loader.className = 'done';
  setTimeout(function() {
    loader.className = 'hide';
  }, 500);
}
// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require foundation
//= require turbolinks
//= require_tree
//= require d3

$(function(){ $(document).foundation(); });

var loader = document.getElementById('loader');
startLoading();
function startLoading() {
  loader.className = '';
}
function finishedLoading() {
  loader.className = 'done';
  setTimeout(function() {
    loader.className = 'hide';
  }, 5000);
}

--- 
+++ 
@@ -20,14 +20,13 @@
 $(function(){ $(document).foundation(); });
 
 var loader = document.getElementById('loader');
-
 startLoading();
 function startLoading() {
   loader.className = '';
 }
-function finishedLoading() {	
+function finishedLoading() {
   loader.className = 'done';
   setTimeout(function() {
     loader.className = 'hide';
-  }, 500);
+  }, 5000);
 }
Remove finishedLoading() call, change timeout to 500 from 5000
