Video demonstration: https://youtu.be/WFC7geBf3ls. The back and forward buttons take about 700 ms to finish. For going back there's no loading state, so no visual feedback until the load finishes completely.
With JS disabled: https://youtu.be/A2xdKVa1IbY
IMO throw out client-side JS-based link following 😛
Dupe of #4635 - the site threw an "Internal error" at me when I filed that so I thought it was lost and I had to type it in again 😦