[Perf] Linux/x64: 1 Regression on 7/13/2026 2:43:38 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [0e7b627c152a3c1885d1db498d81d01de55a3391](https://github.com/dotnet/runtime/commit/0e7b627c152a3c1885d1db498d81d01de55a3391)
Compare | [8df98c4d2d17bcba98193afa9ae2e72908921f86](https://github.com/dotnet/runtime/commit/8df98c4d2d17bcba98193afa9ae2e72908921f86)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0e7b627c152a3c1885d1db498d81d01de55a3391...8df98c4d2d17bcba98193afa9ae2e72908921f86)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in MicroBenchmarks.Serializers.Json_ToString<MyEventsListerViewModel>

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

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

![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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.Serializers.Json_ToString*'
```

### MicroBenchmarks.Serializers.Json_ToString<MyEventsListerViewModel>.SystemTextJson_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)

Start with src/benchmarks/micro/Serializers/Json_ToString.cs around lines 48-50 and compare the listed baseline and test commits. Run the provided benchmarks_ci.py command using the specified filter, then use the linked test report and profiling workflow to investigate the 8% regression. Done means identifying and addressing the regression, with benchmark results showing the issue no longer reproduces.

Written by the indexing model from the issue text.