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Bindable layout has performance issue when loading with more than 100 items using item source. #15544

Open ragulsv opened 2 years ago

ragulsv commented 2 years ago

Description

Bindable layout to generate its content by binding to a collection of 100 items, with the option to set the appearance of each item with a DataTemplate has performance lacking issue.

Steps to Reproduce

  1. Run the sample.
  2. Click the button "Click here".
  3. It takes more than 5 seconds to load.

(or)

  1. Create a simple sample with stack layout.
  2. Bind a Collection of 100 items to the item source.
  3. Load the above page from a button click.
  4. There will be a delay to load the page.

Expected Behavior

Binable layout of 100 childrens need to be loaded without any delay.

Actual Behavior

Binable layout of 100 childrens takes 5 second to loaded.

Basic Information

Environment

``` Microsoft Visual Studio Professional 2022 Version 17.3.0 Preview 6.0 VisualStudio.17.Preview/17.3.0-pre.6.0+32728.150 Microsoft .NET Framework Version 4.8.04084 Installed Version: Professional Visual C++ 2022 00483-10700-11363-AA356 Microsoft Visual C++ 2022 ASP.NET and Web Tools 17.3.375.53775 ASP.NET and Web Tools Azure App Service Tools v3.0.0 17.3.375.53775 Azure App Service Tools v3.0.0 C# Tools 4.3.0-3.22375.15+456937d952ad5c0930293ef32c4fbf8c844a9fef C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Common Azure Tools 1.10 Provides common services for use by Azure Mobile Services and Microsoft Azure Tools. Extensibility Message Bus 1.2.6 (master@34d6af2) Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration. Microsoft JVM Debugger 1.0 Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines Mono Debugging for Visual Studio 17.3.20 (3f4cb00) Support for debugging Mono processes with Visual Studio. NuGet Package Manager 6.3.0 NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/ Office Developer Tools for Visual Studio 17.0.32616.00 Microsoft Office Developer Tools for Visual Studio Razor (ASP.NET Core) 17.0.0.2232702+e1d654e792aa2fe6646a6935bcca80ff0aff4387 Provides languages services for ASP.NET Core Razor. SQL Server Data Tools 17.0.62207.04100 Microsoft SQL Server Data Tools Syntax Visualizer 1.0 An extension for visualizing Roslyn SyntaxTrees. Test Adapter for Boost.Test 1.0 Enables Visual Studio's testing tools with unit tests written for Boost.Test. The use terms and Third Party Notices are available in the extension installation directory. Test Adapter for Google Test 1.0 Enables Visual Studio's testing tools with unit tests written for Google Test. The use terms and Third Party Notices are available in the extension installation directory. TypeScript Tools 17.0.10701.2001 TypeScript Tools for Microsoft Visual Studio Visual Basic Tools 4.3.0-3.22375.15+456937d952ad5c0930293ef32c4fbf8c844a9fef Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Visual C++ for Cross Platform Mobile Development (Android) 17.0.32708.82 Visual C++ for Cross Platform Mobile Development (Android) Visual F# Tools 17.1.0-beta.22363.4+1b94f89d4d1f41f20f9be73c76f4b229d4e49078 Microsoft Visual F# Tools Visual Studio IntelliCode 2.2 AI-assisted development for Visual Studio. VisualStudio.DeviceLog 1.0 Information about my package VisualStudio.Mac 1.0 Mac Extension for Visual Studio VSPackage Extension 1.0 VSPackage Visual Studio Extension Detailed Info Workflow Manager Tools 1.0 1.0 This package contains the necessary Visual Studio integration components for Workflow Manager. Xamarin 17.3.0.295 (d17-3@321c85a) Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android. Xamarin Designer 17.3.0.208 (remotes/origin/d17-3@e4f67afef) Visual Studio extension to enable Xamarin Designer tools in Visual Studio. Xamarin Templates 17.2.28 (9b3d244) Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms. Xamarin.Android SDK 13.0.0.0 (d17-3/030cd63) Xamarin.Android Reference Assemblies and MSBuild support. Mono: dffa5ab Java.Interop: xamarin/java.interop/d17-3@7716ae53 SQLite: xamarin/sqlite/3.38.5@df4deab Xamarin.Android Tools: xamarin/xamarin-android-tools/main@14076a6 Xamarin.iOS and Xamarin.Mac SDK 15.12.0.2 (87f98a75e) Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support. ```

Workaround

https://github.com/ragulsv/BindableLayoutIssue

MitchBomcanhao commented 2 years ago

according to the documentation - https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/layouts/bindable-layouts

Bindable layouts should only be used when the collection of items to be displayed is small, and scrolling and selection isn't required. While scrolling can be provided by wrapping a bindable layout in a ScrollView, this is not recommended as bindable layouts lack UI virtualization. When scrolling is required, a scrollable view that includes UI virtualization, such as ListView or CollectionView, should be used. Failure to observe this recommendation can lead to performance issues.

So it seems that what you're getting is exactly what is expected.

uavci94 commented 10 months ago

Failure to observe this recommendation can lead to performance issues. ??? Yes of course , because collection view or listview has higher performance , is real ? I am sorry. I left using maui and xamarin.