[Perf] System.Text.Json.Serialization Regressions on 7/21/2025 11:54:44 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22621
Queue | TigerWindows
Baseline | [959c2a7a782b4e9e698e0f00cb06afe859d16829](https://github.com/dotnet/runtime/commit/959c2a7a782b4e9e698e0f00cb06afe859d16829)
Compare | [0b2f272204ea0cb7d22d329a684c06cec412f736](https://github.com/dotnet/runtime/commit/0b2f272204ea0cb7d22d329a684c06cec412f736)
Diff | [Diff](https://github.com/dotnet/runtime/compare/959c2a7a782b4e9e698e0f00cb06afe859d16829...0b2f272204ea0cb7d22d329a684c06cec412f736)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Text.Json.Serialization.Tests.ReadJson&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[DeserializeFromStream - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22621/System.Text.Json.Serialization.Tests.ReadJson(Int32).DeserializeFromStream(Mode%3a%20SourceGen).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Text.Json/Serializer/ReadJson.cs#L82-#L89>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 212.45 ns | 243.45 ns | 1.15 | 0.06 | False | | |
|<ul><li>[DeserializeFromStream - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22621/System.Text.Json.Serialization.Tests.ReadJson(Int32).DeserializeFromStream(Mode%3a%20Reflection).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Text.Json/Serializer/ReadJson.cs#L82-#L89>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 211.55 ns | 239.08 ns | 1.13 | 0.05 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/System.Text.Json.Serialization.Tests.ReadJson%28Int32%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/System.Text.Json.Serialization.Tests.ReadJson%28Int32%29_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/System.Text.Json.Serialization.Tests.ReadJson%28Int32%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Serialization.Tests.ReadJson&lt;Int32&gt;*'
```

<details>

### System.Text.Json.Serialization.Tests.ReadJson&lt;Int32&gt;.DeserializeFromStream(Mode: SourceGen)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Serialization.Tests.ReadJson&lt;Int32&gt;.DeserializeFromStream(Mode: Reflection)

#### ETL Files

#### Histogram

#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22621
Queue | TigerWindows
Baseline | [959c2a7a782b4e9e698e0f00cb06afe859d16829](https://github.com/dotnet/runtime/commit/959c2a7a782b4e9e698e0f00cb06afe859d16829)
Compare | [0b2f272204ea0cb7d22d329a684c06cec412f736](https://github.com/dotnet/runtime/commit/0b2f272204ea0cb7d22d329a684c06cec412f736)
Diff | [Diff](https://github.com/dotnet/runtime/compare/959c2a7a782b4e9e698e0f00cb06afe859d16829...0b2f272204ea0cb7d22d329a684c06cec412f736)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Text.Json.Serialization.Tests.ReadJson&lt;Nullable&lt;DateTimeOffset&gt;&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[DeserializeFromStream - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22621/System.Text.Json.Serialization.Tests.ReadJson(Nullable(DateTimeOffset)).DeserializeFromStream(Mode%3a%20SourceGen).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Text.Json/Serializer/ReadJson.cs#L82-#L89>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 276.53 ns | 292.65 ns | 1.06 | 0.05 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/System.Text.Json.Serialization.Tests.ReadJson%28Nullable%28DateTimeOffset%29%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/System.Text.Json.Serialization.Tests.ReadJson%28Nullable%28DateTimeOffset%29%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Serialization.Tests.ReadJson&lt;Nullable&lt;DateTimeOffset&gt;&gt;*'
```

<details>

### System.Text.Json.Serialization.Tests.ReadJson&lt;Nullable&lt;DateTimeOffset&gt;&gt;.DeserializeFromStream(Mode: SourceGen)

#### ETL Files

#### Histogram

#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22621
Queue | TigerWindows
Baseline | [88f2361c958affeaaa24122780fecb680365b558](https://github.com/dotnet/runtime/commit/88f2361c958affeaaa24122780fecb680365b558)
Compare | [0b2f272204ea0cb7d22d329a684c06cec412f736](https://github.com/dotnet/runtime/commit/0b2f272204ea0cb7d22d329a684c06cec412f736)
Diff | [Diff](https://github.com/dotnet/runtime/compare/88f2361c958affeaaa24122780fecb680365b558...0b2f272204ea0cb7d22d329a684c06cec412f736)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in MicroBenchmarks.Serializers.Json_FromStream&lt;LoginViewModel&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[SystemTextJson_SourceGen_ - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows 10.0.22621/MicroBenchmarks.Serializers.Json_FromStream(LoginViewModel).SystemTextJson_SourceGen_.html>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACl2RT2/TQBDF75HyHZZcNhFubFkYpYFF0FKKCrk0UTlWiz1JBvZPNDtuElq+O7t2cuEyK6/fvPnNWwMsGAILJT7KBdbkr8DVW6vpd5gugVAb/AMUpnfBu8cv5O2SCbR9/91v0D0g7Be+AfNhujwGBruCA3fKpW+phltwj/LdcGDiFL1moDim0QyMFsZlUVYXRXVRXq6K2byazcs309nbsiovq9dFMS+KyamTYOdjo2w8O+CcWpf6z74/SUfg9J9gHfIt6CbkVqM7C2rv1rhJk49OW6zHz/La2x0azehdwpdzIRmBoJGZkPet+4auSZdRTV7+TSC3wF8xsCestfmsWf9A3iYfTRgXDuOUokol61dVXc06epVKdkJV/ZGdwFR/TIaDF7Ej/wtqFil4CJm4atE0q7jskrXdZeJBmxbUKg659jEFoHsIreFPT0B6A8NBnr+I/TYucnIQr6I5xyyCGI3Y3xxq0zYwGok8FzeHaGlA+LVYo4le6DbCt/GhROiaExCBa+KrpbzrrSYW+7i1GPcCdcY81N601qn/cY/9fVAdd9QxsgElY3wQkz6ePhegQ0tgwbGc/AOZp8dHkQIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 359.87 ns | 382.93 ns | 1.06 | 0.01 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/MicroBenchmarks.Serializers.Json_FromStream%28LoginViewModel%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_29_2025/refs/heads/main_x64_Windows%2010.0.22621_Regression/MicroBenchmarks.Serializers.Json_FromStream%28LoginViewModel%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.Serializers.Json_FromStream&lt;LoginViewModel&gt;*'
```

<details>

### MicroBenchmarks.Serializers.Json_FromStream&lt;LoginViewModel&gt;.SystemTextJson_SourceGen_

#### ETL Files

#### Histogram

#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>

Name	Value
Architecture	x64
OS	Windows 10.0.22621
Queue	TigerWindows
Baseline	959c2a7a782b4e9e698e0f00cb06afe859d16829
Compare	0b2f272204ea0cb7d22d329a684c06cec412f736
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
DeserializeFromStream - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	212.45 ns	243.45 ns	1.15	0.06	False
DeserializeFromStream - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	211.55 ns	239.08 ns	1.13	0.05	False

[Perf] System.Text.Json.Serialization Regressions on 7/21/2025 11:54:44 PM +00:00 #118173

Description

Run Information

Regressions in System.Text.Json.Serialization.Tests.ReadJson<Int32>

Repro

System.Text.Json.Serialization.Tests.ReadJson<Int32>.DeserializeFromStream(Mode: SourceGen)

ETL Files

Histogram

JIT Disasms

System.Text.Json.Serialization.Tests.ReadJson<Int32>.DeserializeFromStream(Mode: Reflection)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Text.Json.Serialization.Tests.ReadJson<Nullable<DateTimeOffset>>

Repro

System.Text.Json.Serialization.Tests.ReadJson<Nullable<DateTimeOffset>>.DeserializeFromStream(Mode: SourceGen)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in MicroBenchmarks.Serializers.Json_FromStream<LoginViewModel>

Repro

MicroBenchmarks.Serializers.Json_FromStream<LoginViewModel>.SystemTextJson_SourceGen_

ETL Files

Histogram

JIT Disasms

Docs

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