There was a download of Web Performance Tester 6.6.14851 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the program are 6.6, 6.5 and 6.4.
The program lies within System Utilities, more precisely Benchmark. The most frequent installation filename for the software is: webperformance.exe. We recommend checking the downloaded files with any free antivirus. This software is an intellectual property of Web Performance Inc.
From the developer:
Web Performance Tester is an application that allows you to test various aspects related to your browser, and how it handles the heavy load for a certain simulation.
Web Performance User Capacity Analysis clearly measures your site's capacity based on either simple performance goals or complicated Service Level Agreements (SLA).
You may want to check out more software, such as IBM Rational Performance Tester, Atelier Web Firewall Tester or Active Directory Performance Testing Tool ADTest.exe, which might be similar to Web Performance Tester.
General
Benchmark