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In the previous articles, you learned about the execution phases and data call flow, common sources of slow performance, and common performance issues and resolutions in canvas apps. You can also benefit by following the tips and best practices in this article to boost the performance of apps that you create.
Limit data connections
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Don't connect to more than 30 data sources from the same app. Apps prompt new users to sign in to each connector, so every extra connector increases the amount of time that the app needs to start. As an app runs, each connector requires CPU resources, memory, and network bandwidth when the app requests data from that source.
You can quickly measure your app's performance by turning on Developer Tools in Microsoft Edge or Google Chrome while running the app. Your app is more likely to take longer than 15 seconds to return data if it frequently requests data from more than 30 data sources, such as Microsoft Dataverse, Azure SQL, SharePoint, and Excel on OneDrive.
Limit the number of controls
Don't add more than 500 controls to the same app. Power Apps generates an HTML document object model to render each control. The more controls you add, the more generation time Power Apps needs.
You can, in some cases, achieve the same result and have the app start faster if you use a gallery instead of individual controls. Inaddition, you might want to reduce the number of control types on the same screen. Some controls (such as PDF viewer, data table, andcombo box) pull in large execution scripts and take longer to render.
Optimize the OnStart property
Use the ClearCollect function to cache data locally if it doesn't change during the user session. Also, use the Concurrent function to load data sources simultaneously; this can cut the amount of time an app needs to load data in half. More information: Concurrent function in Power Apps
Without the Concurrent function, the following formula loads each of four tables one at a time:
You can confirm this behavior in the Developer Tools for your browser, as shown in the following image.
You can enclose the same formula in the Concurrent function to reduce the overall time that the operation needs:
With this change, the app fetches the tables in parallel, as shown in the following image.
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For more information about the performance problems and resolutions related to OnStart, read OnStart event needs tuning.
Cache lookup data
Use the Set function to cache data from lookup tables locally to avoid repeatedly retrieving data from the source. This technique optimizes performance if the data probably won't change during a session. As shown in the following example, the data is retrieved from the source once, and then referenced locally until the user closes the app.
This method is more useful for data such as contact information, default values, or user information that doesn't change frequently. You can also use this technique with the Defaults and User functions.
Avoid control dependency between screens
To improve performance, the screens of an app are loaded into memory only as they're needed. This optimization can be hampered if, for example, screen 1 is loaded and one of its formulas uses the property of a control from screen 2. Now screen 2 must be loaded to fulfill the dependency before screen 1 can be displayed. Imagine screen 2 has a dependency on screen 3, which has another dependency on screen 4, and so on. This dependency chain can cause many screens to be loaded.
For this reason, avoid formula dependencies between screens. In some cases, you can use a global variable or collection to share information between screens.
There's an exception: In the previous example, imagine that the only way to display screen 1 is by navigating from screen 2. Then screen 2 will have already been loaded in memory when screen 1 is to be loaded. No extra work is needed to fulfill the dependency for screen 2, and therefore there's no performance impact.
Where possible, use functions that delegate data processing to the data source instead of retrieving data to the local device for processing. If an app must process data locally, the operation requires much more processing power, memory, and network bandwidth, especially if the dataset is large.
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To learn about delegable functions supported by specific connectors, go to the connector documentation.
For an example of delegable functions, consider an ID column defined as the Number data type in a SharePoint list. Formulas in the following example will return the results as expected. However, the first formula is non-delegable while the second is delegable.
Because we assume that the ID column in SharePoint is defined with the data type of Number, the right-side value should be a numeric variable instead of a string variable. Otherwise, this mismatch might trigger the formula to be non-delegable.
The use of non-delegable functions and inappropriate data row limits for non-delegable queries can have an adverse effect on the performance of the app. More information: Understand delegation in a canvas app
Use Delayed Load
Turn on the experimental feature for delayed load if your app has more than 10 screens, no rules, and many controls that are on multiple screens and are directly bound to the data source. If you build this type of app and don't enable this feature, app performance can suffer because the controls in all screens must be populated even on screens that aren't open. Also, all screens of the app must be updated whenever the data source changes, such as when the user adds a record.
Working with large datasets
Use data sources and formulas that can be delegated to keep your apps performing well while users can access all the information they need, and avoid hitting the data row limit of 2,000 for non-delegable queries. Fort set the DisplayMode property of controls A, B, C, D, and E to the same complex formula. Instead, set A's DisplayMode property to the complex formula, set B's DisplayMode property to the result of A's DisplayMode property, and so on for C, D, and E.
Enable DelayOutput on all Text input controls
If you have multiple formulas or rules that reference the value of a Text input control, set the DelayedOutput property of that control to true. The Text property of that control will be updated only after keystrokes entered in quick succession have stopped. The formulas or rules won't run as many times, and app performance will improve.
Avoid using Form.Updates in rules and formulas
If you reference a user-input value in a rule or a formula by using a
Form.Updates variable, it iterates over all the form's data cards and creates a record each time. To make your app more efficient, reference the value directly from the data card or the control value.
Review the coding standards for maximizing app performance and keeping apps easier to maintain.
Understand canvas app execution phases and data call flow
Common canvas app performance issues and resolutions
Common sources of slow performance for a canvas app
Common issues and resolutions for Power Apps
Troubleshooting startup issues for Power Apps
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