[Perf] Linux/arm64: 2 Improvements on 5/6/2026 1:27:34 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [cb67209148787d94ee4b4c550a09a037dedd40f3](https://github.com/dotnet/runtime/commit/cb67209148787d94ee4b4c550a09a037dedd40f3)
Compare | [055e04bbff528e950acfa0f5e56aa80c2e7929f7](https://github.com/dotnet/runtime/commit/055e04bbff528e950acfa0f5e56aa80c2e7929f7)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cb67209148787d94ee4b4c550a09a037dedd40f3...055e04bbff528e950acfa0f5e56aa80c2e7929f7)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Xml.Linq.Perf_XElement

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

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

| 78.38 ns | 62.09 ns | 0.79 | 0.14 | False | | |
|

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

| 62.12 ns | 53.18 ns | 0.86 | 0.35 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Xml.Linq.Perf_XElement*'
```

### System.Xml.Linq.Perf_XElement.CreateElementWithNamespace

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Xml.Linq.Perf_XElement.GetElementWithNamespace

#### 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)