[Perf] Windows/x86: 1 Regression on 3/9/2026 10:25:29 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0d0e1291faee412c0b124746bfdd7c6bbdcde5aa](https://github.com/dotnet/runtime/commit/0d0e1291faee412c0b124746bfdd7c6bbdcde5aa)
Compare | [68de53c1ec0e6cc230dc8da5a54e11e03edbd37c](https://github.com/dotnet/runtime/commit/68de53c1ec0e6cc230dc8da5a54e11e03edbd37c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0d0e1291faee412c0b124746bfdd7c6bbdcde5aa...68de53c1ec0e6cc230dc8da5a54e11e03edbd37c)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Serialization.Tests.WriteJson<ClassRecord>

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

• [SerializeToWriter - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 130.48 ns | 143.62 ns | 1.10 | 0.12 | False | | |

![graph]()
[Test Report]()

### 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.WriteJson*'
```

### System.Text.Json.Serialization.Tests.WriteJson<ClassRecord>.SerializeToWriter(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)