I spoke with Meastro and they are very unhelpful when it comes to improving image load time on their themes. I can clearly see that their theme causes very slow image load times as compared to many other e-commerce sites where images load instantly. ...

That doesnt work. I can't believe this is how the widget works. On mobile, the widget opens to the whole screen by default, hiding the website!  Why would you ever want to see a chat window instead of the website you are trying to go to???