Comment by tgv

The problem is not url management. That should happen just once or twice during the life cycle of a page. If it takes 0.1ms or 1ms doesn't have any impact on the usability.

One of my problems was that I wanted to show data in the browser. It is a convenient delivery platform, after all. However, Chrome (and Chrome in particular) has tremendous trouble displaying large pages. A 400x400 table takes a long time to render. I could solve that in JavaScript. I had to, really.

So, as practically always, the problems stem from a combination of factors, and bad programming definitely is one of them.