From the publisher website or publicity

How well does your Web application perform? Will it scale as more users access your site? High levels of user traffic can significantly reduce your site's performance. Web pages may take several minutes to download or your entire site may crash. You can't afford to have your customers wait.

Astra LoadTest is the easiest way to test the scalability and performance of Web applications. With Astra LoadTest, you can emulate the traffic of thousands of users to identify and isolate bottlenecks and optimize the user experience.

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Other tools that may interest you by area:-

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Vendor: Mercury Interactive

Specific books

Automated Web Testing Toolkit

Software Test Automation

Effective Software Testing 50 Specific Ways to Improve Your Testing

Web Performance Tuning, 2nd Edition