ab should be able to separate transfer time from execution time. If ab is used on the same machine, it will take a huge image to make for circa 1 second of additional transfer time. If there's a suspect anyway that's transfer time being taken, it should be trivial to hack the script so that the image is created but not output and then try to benchmark this case (but it's not worth much, after you discover that - say - it's Apache taking the additional second for its buffers or something like that).

In reply to Re: Re: Startup cost, CGI performance by l3nz
in thread Startup cost, CGI performance by dd-b

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