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8: Smart Client Application Performance
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Performance Tuning and Diagnosis
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Tackling performance issues at the design and implementation stages is the most cost effective way to meet your application s performance goals. However, you can only be truly effective in optimizing the performance of your applications if you test your application s performance often and as early in the development phase as possible. While designing and testing for performance are both important, optimizing every component and all of the code at these early stages is not an efficient use of resources, and so should be avoided. Consequently, your application may suffer from unexpected performance problems that you did not anticipate at the design stage. For example, you may experience performance problems due to the unforeseen interaction between two systems or components, or you may use pre-existing code that does not perform as hoped. In this case, you need to track down the source of the performance problem so that you can address it appropriately. This section discusses a number of tools and techniques that will help you diagnose performance issues, and tune your application for optimum performance.
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As you design and architect your smart client application, you should carefully consider the requirements in terms of performance, and define suitable performance goals. When defining these goals, consider how you are going to measure the application s actual performance. Your performance metrics should clearly represent the important performance characteristics of the application. Try to avoid ambiguous or incomplete goals that cannot be accurately measured, such as the application must run fast or the application must load quickly. You need to know the performance and scalability goals of your application so that you can design to meet them and plan your tests around them. Be sure that your goals are measurable and verifiable. Well-defined performance metrics allow you to track the performance of your application accurately so that you can determine whether the application meets its performance goals or not. These metrics should be included in your application s test plan, so that they can be measured during the testing phase of your application. This section focuses on the definition of specific performance goals relevant to a smart client application. If you are also designing and building the network services that the client application will consume, you need to define appropriate performance goals for these as well. In this case, you should be sure to consider the performance requirements of the system as a whole and how the performance of each part of the application relates to the other parts and to the system in its entirety.
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Smart Client Architecture and Design Guide
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Considering the User s Perspective
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As you determine suitable performance goals for a smart client application, you should carefully consider the perspective of the user. For a smart client application, performance is related to usability and user perception. For example, a lengthy operation could be acceptable to the user as long as that user is able to keep working and is provided with adequate feedback on progress of the operation. When determining requirements, it is often useful to break an application s functionality into a number of usage scenarios or use cases. You should identify the use cases and scenarios that are critical and required to meet specific performance objectives. Tasks that are common to many use cases and that are performed often should be designed to perform well. Similarly, tasks that demand the user s complete attention and from which they can t switch to perform other tasks need to provide an optimized and efficient user experience. Tasks that are not used very often or that do not stop the user from performing other tasks may not need to be highly tuned. For each performance-sensitive task that you identify, you should precisely define what the user does and how the application responds. You should also determine which network and client resources or components each task uses. This information will influence the performance goals and will drive the tests that measure performance. Usability studies provide a very valuable source of information and can greatly influence the definition of performance goals. A formal usability study can be very helpful in determining how users perform their work, which usage scenarios are common and which are not, what tasks the users perform often, and what characteristics of the application are important from a performance perspective. If you are building a new application, you should consider providing a prototype or mock-up of the application to allow rudimentary usability testing to be carried out.
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