Good times for a CGI script are completely up to the task and the expected load. Are you planning to have it hit multiple times a second? Well then, the total time to execute should be less than a fraction of a second or so. If it will only get hit occasionally or if the scripts don't contend heavily for system resources but just wait on external resources, they can take more time overall.

In most cases, Benchmark is better at testing two pieces of code to determine which is the most efficient. Throwing it at a single piece of code is trickier.

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$you = new YOU;
honk() if $you->love(perl)