I'm discussing UI/UX, not the stack. The back button is... something else here.
The commenter is complaining that the back button took too long and the creator responded to indicate it's a load issue. At no point is that in the realm of design, which is what my comment was about.
The modern web designers and app builders clearly don't agree with me with their heavy websites that make the browser eat a gig or so of RAM and all have unnecesarily slow UI's.