[Perf] Linux/x64: 1 Improvement on 8/28/2026 8:01:56 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [22d4a3b8329dca505095f2b09da0763f52678d8d](https://github.com/dotnet/runtime/commit/22d4a3b8329dca505095f2b09da0763f52678d8d)
Compare | [100da3f94464f99616ee4a401670bec491ebc787](https://github.com/dotnet/runtime/commit/100da3f94464f99616ee4a401670bec491ebc787)
Diff | [Diff](https://github.com/dotnet/runtime/compare/22d4a3b8329dca505095f2b09da0763f52678d8d...100da3f94464f99616ee4a401670bec491ebc787)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Collections.ContainsTrue<String>

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

• [ImmutableList - 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.ContainsTrue*'
```

### System.Collections.ContainsTrue<String>.ImmutableList(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 performance/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs#L236-L245 and run the provided benchmarks_ci.py command for the System.Collections.ContainsTrue filter. Compare the reported baseline and test results, then use the linked test report and profiling workflow documentation to determine what change is actionable; done means a validated improvement with benchmark evidence.

Written by the indexing model from the issue text.