How long is too long for a cgi script?

I have a 4000 line php cgi script that is not memory or cpu intensive.
It runs in 1 second. Now I am getting a lot of customer requests to add
in new features. My question is if there is a point where my code will
be too long and take too long to run (i.e > 5 seconds). I would really
like to have my script rival the functionality of a desktop application
but can php do it?

My server is a dual processor with 2GB ram.

.

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