Hello hallibus, and welcome to the GreenSock Forum!   You could do this so your GSAP code only runs when the DOM is ready and the window has loaded:   // run preloader code here ... // wait until DOM is ready document.addEventListener("DOMContentLoaded", function(event) { // wait until window is loaded - meaning all images, stylesheets, js, fonts, media assets, and links window.addEventListener("load", function(e) { // run all GSAP code here