Plugin Laser Loader is very small and fast. The plugin adds a little loading progress bar at the top of the page to indicate that the next page is loading.

WPPU is the best and full control WordPress preloader plugin. WordPress Preloader Unlimited is an ultimate plugin for preloader of your WordPress website.

DV Loading is a WordPress site preloader plugin which allows you to create a page loading animation for your site using rich set of customization options.

LoftLoader Pro is a small yet powerful WordPress page preload plugin for adding unique and fun preload animations to your website.