No, it doesn't. Other games also use webp images, and don't cause overload... but they have competent coders who know how to fix issues like this, and don't confuse programing language and engines...

Basic problem with this game is saddog is talented artist, and rather creative, but he took harder task than he can do. He is simply not coder... that's why we always have delay, bugg fests (somebody will remember last year version where sex scenes in basement were introduced... nothing worked in way it was supposed to)