Lazy loading scripts after the first user interaction with the site.

lazyLoadScript.js

// Source: https://marketingmakers.net/en/how-to-improve-zopim-zendesk-chat-load-time-or-any-other-external-javascript/

// Lazy loading scripts after the first user interaction with the site
function setupInteractLoad(fn) {
  function fn_tmp() {
    destroyInteractLoadEvent(fn_tmp);
    fn();
  }
  createInteractLoadEvent(fn_tmp);
}
// Setting up triggers for user interaction with site
function createInteractLoadEvent(fn) {
  document.addEventListener('scroll', fn);
  document.addEventListener('mousedown', fn);
  document.addEventListener('mousemove', fn);
  document.addEventListener('touchstart', fn);
  document.addEventListener('keydown', fn);
}
// Delete triggers for user interaction with site
function destroyInteractLoadEvent(fn) {
  document.removeEventListener('scroll', fn);
  document.removeEventListener('mousedown', fn);
  document.removeEventListener('mousemove', fn);
  document.removeEventListener('touchstart', fn);
  document.removeEventListener('keydown', fn);
}