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. You could see a similar UI pattern on YouTube or Medium.
Demo:
https://codecanyon.net/item/laser-loader-stylish-progress-bar-preloader/26005913
https://www69.zippyshare.com/v/flFcYXTJ/file.html
http://ul.to/qv2tgjoj
https://www.upload.ee/files/12291242/laserloader-102.rar.html
https://ulozto.net/LqcBS3Rjhlfr
https://www.sendspace.com/file/obbcd7
https://novafile.com/192vijpwsxdm
https://nippyshare.com/v/545f65
https://www.mirrored.to/files/CWDWTMDU/laserloader-102.rar_links
https://mirrorace.org/m/1F8c7
https://hxfile.co/lh8oyogt3q49
https://dropapk.to/4cg8o74hkczg
http://dl.free.fr/rPJODoQz0
https://ddownload.com/bxvmbajt9dbt
https://dbree.org/v/f65c06
https://bayfiles.com/pe06K3W0od
https://anonfiles.com/vd04KdW5oa
https://1fichier.com/?tiowqno2192k9bgb7wuc
This file has UNTOUCHED status - (original developer code without any tampering done)