Plugin Laser Loader is very small (4,9 KiB) and fast. The plugin adds a little loading progress bar at the top of the page to indicate that the next page is loading.

PageLoader is a wildly customizable loading screen and progress bar plugin for WordPress.

Time Loader is a story-driven, physics-based puzzle platformer with a twist. At the helm of a small robot, you’ll travel back to the 90s to prevent a tragic accident.