This blog post provides guidelines for scalability testing. It defines the difference between load, performance and scalability testing. A well-designed workload is the first requirement for any performance testing is a well-designed workload. The post provides hints how to to plan, run and analyze scalability tests.

Running stress- or load-tests of asynchronous REST/HTTP services with JMeter is only the first step in performance improvement. If the applications have problems when load increases, you need to find where the issues are. You can spend a lot of time to examine the code base before – if ever – finding the cause of the performance problem. This blog post provides an introduction on how to record and examine telemetry performance measurements with Yourkit3 after running JMeter tests.

In this blog post, Joe Colantonio explains in detail and clearly the concept of “throughput” in performance testing and and why it is one of the top metrics used to measure how well an application is performing.

This video shows how to use WebPageTest for performance testing and analysis. It presents how to test the impact of 3rd party content on your site, understanding the REAL user experience with visual testing and a brief introduction to scripting interactive tests.

This video describes an approach to simple performance testing that has proven very valuable when building public, content–rich web sites. Automation and data gathering during development, testing and maintenance has provided a way to ensure robust and predictable performance on web sites that now deliver more than one million pages per day.

This part of Microsoft’s patterns and practices material discusses the key concepts of load testing and allow you to learn how to load-test a Web application.

In this blog post, Patrick Weibel shares his experience in detecting performance problems in a .NET environment.

This video shows how to do performance testing during development, testing and production by starting early in the development phase, breaking the test into pieces and testing continuously.
Watch this video on infoq.com

As web users, we know that the speed at which a page loads or refreshes is paramount to its success. This article will help you gain a better understanding of the factors that contribute to your web application’s performance. Learn to identify these issues and to find the bottlenecks with your client-side content. Explore performance problems, and solutions, for JavaScript, DOM, CSS, and Dojo widgets. An example walks you through fine-tuning a Dojo widget by using YSlow and Firebug.