[Perf] Linux/x64: 1 Regression on 9/9/2026 6:49:16 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [da9fcf3d9033b0eb2a277a60fb3239e53b849adb](https://github.com/dotnet/runtime/commit/da9fcf3d9033b0eb2a277a60fb3239e53b849adb)
Compare | [c35a46ec58817a320d41fbb64abfd4ac176cb53b](https://github.com/dotnet/runtime/commit/c35a46ec58817a320d41fbb64abfd4ac176cb53b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/da9fcf3d9033b0eb2a277a60fb3239e53b849adb...c35a46ec58817a320d41fbb64abfd4ac176cb53b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.ContainsTrueComparer<String>

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

• [ImmutableSortedSet - 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 'System.Collections.ContainsTrueComparer*'
```

### System.Collections.ContainsTrueComparer<String>.ImmutableSortedSet(Size: 512)

#### 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 the benchmark source at src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrueComparer.cs and compare the baseline and test commits linked in the issue. Run the provided benchmarks_ci.py command, then inspect the linked test report and performance graph to identify the regression; done means the cause is understood and the benchmark no longer regresses.

Written by the indexing model from the issue text.