In the script of ACT, it is obvious that we need to edit it and put some more code to get the desired result. For e.x implementation of file to fetch the record that will form the request body of the "POST" request.
But here my question is, does this extra code will differ the result or not i.e. will deteriorate the result timing of the load run? Or will show no effect is result.
I've ran tests that have a lot of custom code in them, buffer 500,000 bytes for the response, use test.trace for every response to keep track of timings and performance, and have used up to 200 threads without significant client-side CPU performance impact. Depends on the machine you're running from, I'd think. But, as ACT doesn't use hardly any overhead to begin with, and doesn't have the additional detail that other products have, one side effect is that it doesn't eat much performance at all.