I need to create a web page that does fairly complicated calculations based on a few variables entered through an online form. What would you do to make it as fast possible (CGI, PHP, Javascript or something else?)
Computers are really good at doing math. “Calculate something” is really not a whole lot of info. Are you calculating a billion recursions or the first 10,000,000 digits of pi? Or are you just doing some kind of basic non-recursive formula?
If its the latter, JavaScript should be fine.
As mawburn said, this isn’t a whole lot of info to go on.
That said, Python’s numpy may be of interest to you, if you are developing the site in Python.