Web Performance Analyzer is a Web performance tool that allows designers to measure, analyze, estimate, and track Web page performance. It is available as a standalone program and an Eclipse plugin. WPA captures Web pages as you browse and reveals dynamic HTTP requests, forwards, and other low-level details that aren't visible from a browser. But unlike other simple protocol sniffers, WPA can tell you if your Web pages are getting faster or slower by replaying recorded sessions and comparing the current performance to previous measurements.
Web Performance Load Tester is a suite of testing tools for Web servers, including load testing, Web page performance analysis, and operating system tuning. The statistical analysis in the Load Testing Module takes your site's performance criteria, and determines the number of users your Web site can handle. Because data is collected at the URL level, it not only identifies slow Web pages, but identifies the particular part of the Web page that caused the problem. It includes hard-to-find features such as IP spoofing, client certificates, multiple simultaneous test cases, authentication, SSL recording and playback, automated analysis, AJAX support, SOAP support, and more.