[Perf] Linux/x64: 1 Regression on 8/25/2026 5:23:38 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [df846d69e1666f9c6060f2487975b568f3ed93bb](https://github.com/dotnet/runtime/commit/df846d69e1666f9c6060f2487975b568f3ed93bb)
Compare | [cd254340926a9de135f596224d5d4daff12c2395](https://github.com/dotnet/runtime/commit/cd254340926a9de135f596224d5d4daff12c2395)
Diff | [Diff](https://github.com/dotnet/runtime/compare/df846d69e1666f9c6060f2487975b568f3ed93bb...cd254340926a9de135f596224d5d4daff12c2395)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions 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 linked ContainsTrue.cs benchmark and the baseline/compare commits, then run the documented benchmarks_ci.py command for the System.Collections.ContainsTrue filter. Use the linked test report and performance graph to investigate the regression; done means the cause is identified and the benchmark no longer shows the reported slowdown.

Written by the indexing model from the issue text.