2.5.1 Application design problems
Many performance problems, however, cannot be fixed by utilizing more hardware or changing WebSphere parameters as they are related to the application design. Because of this, you really want to make performance testing (and tuning) part of your development and release cycles. It will take much more effort and money to correct the problem after it occurred in production than to fix the problem up front.
The value of frequent testing starting early during the development cycle ensures that performance and scalability bottlenecks are identified early enough to take corrective action either through application remediation or by identifying additional hardware requirements. In addition to minimizing performance and scalability issues, application problems are also identified earlier and have less of an opportunity to manifest themselves in production.