Changing load sequence of elements on homepage

Hi there
I'm trying out the SunoMe plugin "Welcome Mat" feature which shows uses a different CTA page before they scroll down to the actual home page. You can check it out at

Right now my site is really slow on loading. I'd like to change the loading sequence to put the SumoMe plugin ahead of everything else. So while users are looking at the Sumome CTA, the rest of my site can load.