The big problem with the non-JavaScript solution is the enormous expense in bandwidth

[brumbino]

The big problem with the non-JavaScript solution is the enormous expense in bandwidth. With every guess, a new HTML page is downloaded from the server. That's a lot of traffic!

[adakist]

From the user's perspective, this translates to a slow game. It's okay for the user to deliberate about his or her next move, but the computer is expected to respond instantly! Instead, the user gets to watch the status bar display the number of seconds until the next page is downloaded.