[Perf] Linux/x64: 1 Regression on 7/29/2026 2:14:39 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2aa2ce008a33a25ac77f4f340b628e135b94087f](https://github.com/dotnet/runtime/commit/2aa2ce008a33a25ac77f4f340b628e135b94087f)
Compare | [3dad2c9f5b81d9263c01399d8b28c32b979c2da5](https://github.com/dotnet/runtime/commit/3dad2c9f5b81d9263c01399d8b28c32b979c2da5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2aa2ce008a33a25ac77f4f340b628e135b94087f...3dad2c9f5b81d9263c01399d8b28c32b979c2da5)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Collections.Perf_DefaultFrozenDictionary

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

• [ToFrozenDictionary - Duration of single invocation]()
• [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.Perf_DefaultFrozenDictionary*'
```

### System.Collections.Perf_DefaultFrozenDictionary.ToFrozenDictionary(Count: 1000)

#### 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 baseline and compare commits linked in the issue, then review the System.Collections.Perf_DefaultFrozenDictionary report and graph. Run benchmarks_ci.py with the provided filter after setting up the dotnet/performance workflow. Done means the regression is reproduced, its responsible change is identified, and the benchmark result is restored or the cause is documented.

Written by the indexing model from the issue text.