Why does MY WhatsApp web take so long to load?
I know, right? The issue of it loading normally and fast and then all of a sudden it takes 15 seconds for all the imagery etc. to load in Whats app Web. The problem most likely is your browser; I test Chrome, Brave &amp; Firefox (I use the last one by default) and turns out that Chrome loads nearly immediate, whereas Firefox loads the longest. Annoying, but nothing can be done as far as I know at the moment. 

See link for more information. 

https://menafn.com/1098516091/TechBytes-Handy-tips-to-avoid-WhatsApp-Web-loading-issues