[Perf] Linux/x64: 1 Improvement on 8/2/2026 11:04:49 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a2f953fe266dc72602436e77614a9e10f60a7128](https://github.com/dotnet/runtime/commit/a2f953fe266dc72602436e77614a9e10f60a7128)
Compare | [abcd6eb3137ac133ef7f73eae95e7928160386c9](https://github.com/dotnet/runtime/commit/abcd6eb3137ac133ef7f73eae95e7928160386c9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a2f953fe266dc72602436e77614a9e10f60a7128...abcd6eb3137ac133ef7f73eae95e7928160386c9)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Collections.CtorDefaultSize<Int32>

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

• [List - 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.CtorDefaultSize*'
```

### System.Collections.CtorDefaultSize<Int32>.List

#### 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/Create/CtorDefaultSize.cs and the benchmarking workflow documentation. Run the provided benchmarks_ci.py command with the System.Collections.CtorDefaultSize filter, then compare the generated results with the linked report. Done requires a clear triage conclusion about the reported performance change, since the issue does not name a code change.

Written by the indexing model from the issue text.