Generic speed question (PHP vs.)

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http://www.unix.com – Hi, On a hosted linux environment which I have very little control over, I have a PHP script that takes in X number of floats, performs Y number of simple recursive arithmetic calculations, and produces some output for display to the user. When I first created the script, 'X' and 'Y' were both in the single digits, and execution time wasn't really important because I was in the micro-second range, so that simple php script was good enough. Today, the number of variables and calculations are rapidly increasing. I'm still in the sub-second range, but as time goes on I may need to start payin (HowTos)