As someone who used to commute through London on the tube and knows the underground wifi very well, you take on board the limitations of the connection. And you

As someone who used to commute through London on the tube and knows the underground wifi very well, you take on board the limitations of the connection. And you know the connection is going to fluctuate so you're not going to be doing anything serious. Broken images and incorrectly loaded CSS can also break pages and make them unusuable so where do we draw the line? I do get your point but on the other hand many sites are using JS frameworks for good reason and 5kb is absolutely nothing to improve the user experience. You really can't complain about the size of a 5kb javascript file in this day and age otherwise let's just revert back to HTML 2 or 3 to cater for all edge cases.