[Perf] Linux/x64: 2 Improvements on 9/2/2026 11:01:35 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [600c5b67ae4680acf39f6e85529973930bda4168](https://github.com/dotnet/runtime/commit/600c5b67ae4680acf39f6e85529973930bda4168)
Compare | [399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33](https://github.com/dotnet/runtime/commit/399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33)
Diff | [Diff](https://github.com/dotnet/runtime/compare/600c5b67ae4680acf39f6e85529973930bda4168...399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

• [OrderedDictionary - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 1.70 μs | 1.35 μs | 0.79 | 0.22 | False | | |

![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<String>.OrderedDictionary

#### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [600c5b67ae4680acf39f6e85529973930bda4168](https://github.com/dotnet/runtime/commit/600c5b67ae4680acf39f6e85529973930bda4168)
Compare | [399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33](https://github.com/dotnet/runtime/commit/399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33)
Diff | [Diff](https://github.com/dotnet/runtime/compare/600c5b67ae4680acf39f6e85529973930bda4168...399c3eb8ba823f00f9a250de4a3cdbdfb5d18f33)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Reflection.Metadata.Perf_TypeName

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

• [Parse_AssemblyQualifiedName - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 109.60 μs | 101.49 μs | 0.93 | 0.23 | False | | |

![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.Reflection.Metadata.Perf_TypeName*'
```

### System.Reflection.Metadata.Perf_TypeName.Parse_AssemblyQualifiedName(input: typeof(System.Int32&))

#### 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 benchmarking workflow in the linked dotnet/performance documentation and reproduce the two filters with benchmarks_ci.py. Compare the reported baseline and test commits, then inspect the linked benchmark reports and the System.Reflection.Metadata benchmark source at Perf.TypeName.cs#L48-L50. Done means determining whether the reported improvements are valid and documenting the triage result.

Written by the indexing model from the issue text.