There is a free Microsoft load testing tool called WCAT . This is a command line HTTP load generator that repeats a test case script. To avoid creating a script manually, you can write a test file to Fiddler and then generate the script using the WCAT Fiddler extension. This blog has step-by-step instructions that I tested, and it works.
When asked about reusing IIS log: check this source. It describes how to create a WCAT script by querying the IIS log using Log Parser. I have not tested it.
Vadim kleyzit
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