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mentioned earlier, there s no better gauge than for you to ll out your own forms while simulating what your users would do (ie, by using the same hardware, connection, and realistic scenarios) Keep in mind that form load latency will increase as the simultaneous number of concurrent users increases Along the same lines of the File Attachment control, form templates with digitally signed sections may also slightly degrade loading performance For absolute best performance, we recommend adding section signing to a separate view in the form This way, downloading the necessary data from the server (for the ActiveX control and the signature-related form data) is done only when necessary and is isolated in a view that will be visited only during signing If you had the digitally signed section on the default view, for example, it would cause the extra download of data to happen every time the form is loaded Despite the cost of adding extra views to isolate relatively expensive operations such as digitally signing data and attaching les, this technique de nitely pays off The additional views (and extra postbacks to switch to and from the view) scale much better during peak server use than they do if you put them all on the default view The existence of Rich Text Box controls, even many of them, will not cause a performance problem However, you ll start seeing performance issues when a lot of HTML is stuffed into one or more of these controls When users enter data into a Rich Text Box, it can come from almost anywhere A simple copy and paste can insert HTML from Word, an e-mail, or any Web page If the content is large enough, hundreds of kilobytes or more can be inserted into a Rich Text Box, which is then sent to the server On a full page postback (eg, loading the form or switching views), the server needs to push that entire HTML blob back to the browser You can probably see how this can become a performance problem The best advice we can give is to limit the amount of HTML that s needed in any one Rich Text Box Unfortunately, there s no UI in InfoPath to limit the amount of data a user can insert into a Rich Text Box control The best way to validate the amount of data in a Rich Text Box is to de ne a Validating event handler for the XHTML node and get a count of characters from the eld s OuterHtml or Value property While the OuterHtml property will tell you how much total data has been entered, it doesn t tell you the amount of visual data that has been entered On the other hand, the Value property
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17: Advanced Forms Ser vice s
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will give you the visual data But Value doesn t hint as to how much HTML tag-speci c data (eg, tables, images, and so on) exists
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Data Connections Nothing will make your forms feel more sluggish than to execute slow data connections The more query and submit connections used during form lling, the slower you should expect the form to load and react This is especially true with connections beyond the farm or with slow hardware or network speeds Instead of initializing data sources (with query connections) on form load (the last checkbox in the Data Connection Wizard for secondary data sources), consider executing them on demand when they re needed You can do this by using a rule or by calling the Execute() method on the data connection in form code We highly recommend that you independently test all data connections outside of InfoPath Data connections are synchronously executed by Forms Services The total time includes the time needed to send the request from Forms Services to the external data source and then to receive the response Remember that this total time is added to the time it takes for Forms Services to just process a postback request Form View State A major bottleneck when serving hundreds of forms to browser clients is maintaining session state Recall that the shared session state service (SSS) uses a SQL Server database to persist a single form- lling session and its data When too many sessions are being managed by Forms Services, communicating with the SQL Server to maintain all of those sessions can become quite expensive In fact, it becomes one of the rst bottlenecks when serving and managing many forms all at the same time Session state performance also becomes much worse as the size of sessions grows larger, but that s a secondary concern One of the rst signs that SQL Server session state is becoming a bottleneck is when the data stream between the WFE servers and SQL Server stabilizes at a high level because of the large amount of traf c Thanks to a special feature that pushes the session state to the client browser (instead of the SQL Server), we can alleviate the SQL Server bottleneck! The trick is to reduce the overall chat between the WFEs and SQL
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