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8: Smart Client Application Performance
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Using threads efficiently. If you use a user interface (UI) thread to perform blocking I/O bound calls, the UI may seem unresponsive to the user. Creating a large number of unnecessary threads can result in poor performance because of the overhead of creating and shutting down threads. Using transactions efficiently. If the client has local data, then using atomic transactions can help you to ensure that that data is consistent. Because the data is local, the transaction is also local rather than distributed. For smart clients that are working offline, any changes made to the local data are tentative. The client needs to synchronize the changes when it goes online again. For data that is not local, it is possible to use distributed transactions in some cases (for example when services are in the same physical location with good connectivity and where the service supports it). Services such as Web services and Message Queuing do not support distributed transactions. Optimizing application startup time. Fast application startup time allows the user to begin interacting with the application more quickly, which gives the user an immediate and favorable perception of application performance and usability. Your application should be designed so that only those assemblies that are required are loaded on application startup. Avoid using large numbers of assemblies because loading each assembly incurs a performance cost. Managing available resources efficiently. Poor design decisions, such as implementing finalizers when they are not needed, failing to suppress finalization in the Dispose method, or failing to release unmanaged resources, can lead to unnecessary delays in reclaiming resources and can create resource leaks that degrade application performance. Applications that fail to properly release resources, or explicitly force garbage collection, can prevent the CLR from efficiently managing memory. Optimizing Windows Forms performance. Smart client applications rely on Windows Forms to provide a rich and responsive user interface. There are a number of techniques you can use to ensure that Windows Forms provide optimal performance. These include reducing the complexity of the user interface, and avoiding loading large amounts of data at once.
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In many cases the perceived performance of your application from the user s perspective is at least as important as the actual performance of the application. You can create an application that appears to perform much more efficiently to the user by making certain changes to your design, such as using background asynchronous processing (to keep the UI responsive), showing a progress bar to indicate the progress of tasks, and providing the option for users to cancel long running tasks. These issues are discussed in more detail in throughout this section.
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Smart Client Architecture and Design Guide
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Caching is an important technique to improve application performance and provide a responsive user interface. You should consider the following options: Caching frequently retrieved data to reduce roundtrips. If your application has to interact frequently with a network service to retrieve data, you should consider caching that data on the client, reducing the need to obtain the data repeatedly over the network. This can increase performance substantially, providing near instantaneous access to the data, and removing the risk of network delays and outages that can adversely affect the performance of your smart client application. Caching read-only reference data. Read-only reference data is usually an ideal candidate for caching. Such data is used to provide data for validation and user interface display purposes, such as product descriptions, IDs, and so on. Because this kind of data cannot be changed by the client, it can usually be cached without any further special handling on the client. Caching data that is to be sent to network-located services. You should consider caching data that is to be sent to a network-located service. For example, if your application allows users to enter order information that consists of a number of discrete items of data gathered over a number of forms, consider allowing the user to enter all of the data, and then send it in one network call at the end of the entry process. Minimizing caching of highly volatile data. Before you can cache any volatile data, you need to consider how long it can be cached before it becomes stale or otherwise unusable. If data is highly volatile and your application relies on up-to-date information, it is likely that the data can only be cached for a short time, if at all. Minimizing caching of sensitive data. You should avoid caching sensitive data on the client because, in most cases, you cannot guarantee the physical security of the client. However, if you do cache sensitive data on the client, you will generally need to encrypt the data, which has its own performance implications. Further issues surrounding data caching are covered in more detail in 2 of this guide. Also see the Caching section of Improving .NET Application Performance and Scalability, 3, Design Guidelines for Application Performance (http://msdn.microsoft.com/library/default.asp url=/library/en-us/dnpag/html /scalenetchapt03.asp) and Improving .NET Application Performance and Scalability, 4, Architecture and Design Review of .NET Application for Performance and Scalability (http://msdn.microsoft.com/library/default.asp url=/library/en-us/dnpag /html/scalenetchapt04.asp).
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