.NET 8 slower than .NET 7?

[kcrg]

.NET 8 RC1	.NET 7	Xamarin.Forms

It's not a big deal, but I'm curious why 🧐

Device: Samsung Galaxy A34 5G Android 13

[jonathanpeppers]

Are these Release builds?

Considering how the .NET 7/8 are so much slower, I would assume those might be using the interpreter like a Debug build would? This is turned on for Debug to enable C# hot reload.

[jonathanpeppers]

I may have read the screenshots backwards, it's been a while. Higher is better.

[kcrg]

@jonathanpeppers Both Maui apps were built with default Release settings. For .NET 8, I added a new project to quickly accommodate the changes between .NET 7 and 8 and copy-pasted the code to MainPage.

.NET 7 csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
  	<TargetFrameworks>net7.0-android;net7.0-ios;net7.0-maccatalyst</TargetFrameworks>
  	<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net7.0-windows10.0.19041.0</TargetFrameworks>
  	<DisableTransitiveFrameworkReferenceDownloads>true</DisableTransitiveFrameworkReferenceDownloads>
  	<OutputType>Exe</OutputType>
  	<RootNamespace>lols</RootNamespace>
  	<UseMaui>true</UseMaui>
  	<SingleProject>true</SingleProject>
  	<ImplicitUsings>enable</ImplicitUsings>

  	<!-- Display name -->
  	<ApplicationTitle>lols</ApplicationTitle>

  	<!-- App Identifier -->
  	<ApplicationId>com.companyname.lols</ApplicationId>
  	<ApplicationIdGuid>c8f35716-0092-4ac1-8a44-299f94f7df40</ApplicationIdGuid>

  	<!-- Versions -->
  	<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
  	<ApplicationVersion>1</ApplicationVersion>
  </PropertyGroup>

  <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">
  	<SupportedOSPlatformVersion>10.0.17763.0</SupportedOSPlatformVersion>
  	<TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
  </PropertyGroup>

  <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">
  	<SupportedOSPlatformVersion>21.0</SupportedOSPlatformVersion>
  	<AndroidPackageFormat>apk</AndroidPackageFormat>
  	<!-- Update if you want to run on emulator, etc. -->
  	<!--<RuntimeIdentifier>android-arm64</RuntimeIdentifier>-->
  </PropertyGroup>

  <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">
  	<SupportedOSPlatformVersion>14.2</SupportedOSPlatformVersion>
  	<ProvisioningType>automatic</ProvisioningType>
  	<CodesignKey>Apple Development: Created via API (7DDTKCUL5G)</CodesignKey>
  	<CodesignProvision>VS: WildCard Development</CodesignProvision>
  </PropertyGroup>

  <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">
  	<SupportedOSPlatformVersion>14.0</SupportedOSPlatformVersion>
  </PropertyGroup>

  <ItemGroup>
  	<!-- App Icon -->
  	<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />

  	<!-- Splash Screen -->
  	<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />

  	<!-- Images -->
  	<MauiImage Include="Resources\Images\*" />
  	<MauiImage Update="Resources\Images\dotnet_bot.svg" BaseSize="168,208" />

  	<!-- Custom Fonts -->
  	<MauiFont Include="Resources\Fonts\*" />

  	<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
  	<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
  </ItemGroup>

  <ItemGroup>
  	<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="7.0.0" />
  </ItemGroup>

</Project>

.NET 8 RC1 csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
  	<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
  	<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks>
  	<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
  	<!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->

  	<!-- Note for MacCatalyst:
  	The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
  	When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifer>.
  	The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
  	either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
  	<!-- ex. <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->

  	<OutputType>Exe</OutputType>
  	<RootNamespace>lols.maui8</RootNamespace>
  	<UseMaui>true</UseMaui>
  	<SingleProject>true</SingleProject>
  	<ImplicitUsings>enable</ImplicitUsings>

  	<!-- Display name -->
  	<ApplicationTitle>lols.maui8</ApplicationTitle>

  	<!-- App Identifier -->
  	<ApplicationId>com.companyname.lols.maui8</ApplicationId>

  	<!-- Versions -->
  	<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
  	<ApplicationVersion>1</ApplicationVersion>

  	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
  	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>
  	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
  	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
  	<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
  	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
  </PropertyGroup>

  <ItemGroup>
  	<!-- App Icon -->
  	<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />

  	<!-- Splash Screen -->
  	<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />

  	<!-- Images -->

  	<!-- Custom Fonts -->
  	<MauiFont Include="Resources\Fonts\*" />

  	<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
  </ItemGroup>

  <ItemGroup>
  	<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
  	<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
  	<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0-rc.1.23419.4" />
  </ItemGroup>

  <!-- Build Properties must be defined within these property groups to ensure successful publishing
     to the Mac App Store. See: https://aka.ms/maui-publish-app-store#define-build-properties-in-your-project-file -->
<PropertyGroup Condition="$(TargetFramework.Contains('-maccatalyst')) and '$(Configuration)' == 'Debug'">
  <CodesignEntitlements>Platforms/MacCatalyst/Entitlements.Debug.plist</CodesignEntitlements>
</PropertyGroup>

<PropertyGroup Condition="$(TargetFramework.Contains('-maccatalyst')) and '$(Configuration)' == 'Release'">
  <CodesignEntitlements>Platforms/MacCatalyst/Entitlements.Release.plist</CodesignEntitlements>
  <UseHardenedRuntime>true</UseHardenedRuntime>
</PropertyGroup>
</Project>

[jonathanpeppers]

What device is this?

[kcrg]

@jonathanpeppers

Device: Samsung Galaxy A34 5G Android 13

[jonathanpeppers]

I'll put this on my list to dotnet-trace both.

My first guess the regression might be: dotnet/maui#13818 (review)

But maybe I can just fix one thing and get .NET 7 & 8 to at least be the same for GA?

[jonathanpeppers]

Yeah, the "setter specificity" PR contributes about this much:

.NET 7
 8.5% microsoft.maui.controls!Microsoft.Maui.Controls.BindableObject.GetValue
 1.2% microsoft.maui.controls!Microsoft.Maui.Controls.BindableObject.SetValue
.NET 8
11.0% microsoft.maui.controls!Microsoft.Maui.Controls.BindableObject.GetValue
 2.8% microsoft.maui.controls!Microsoft.Maui.Controls.BindableObject.SetValue

4.1% (times 377/second) is about 15 LOLs per second, just as a guess to how many LOLs that might be.

So, there might be something else slowing down as well?

[kcrg]

@jonathanpeppers .NET 8 RC2 is definitely better than RC1, almost on par with .NET 7

.NET 8 RC2	.NET 7

[jonathanpeppers]

Thanks, I believe this is probably where we are going to land for .NET 8 GA.

There is a community contribution to help make BindableProperty even better that could help even more on this one:

dotnet/maui#17756

But I think it will probably be .NET 8 servicing before this ships (if completed).