Step 1: Invest in good application design
Nothing has a greater impact on application performance than application design. A poorly designed application will perform badly on the best hardware, and throwing more hardware at a bad design will often result in little application performance improvement.
Spend your up-front resources on sound application design principles and an exhaustive and representative QA process. For instance, during the design and development phases, developers should keep a close eye on the bottlenecks and address the most significant problem areas. During QA, the application should be load-tested using products like Segue Software Inc.'s SilkCentral, Mercury Interactive Corp.'s LoadRunner or even Microsoft Visual Studio's Application Center Test to see how the application performs under representative load and stress.
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