[Perf] Linux/arm64: 3 Improvements on 6/23/2026 3:44:23 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [461fd2adbf736b4298d9a0c58ad8dbcecaf83629](https://github.com/dotnet/runtime/commit/461fd2adbf736b4298d9a0c58ad8dbcecaf83629)
Compare | [0d1a20fb14109f277df06ebee3f83c964f9dcc61](https://github.com/dotnet/runtime/commit/0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Diff | [Diff](https://github.com/dotnet/runtime/compare/461fd2adbf736b4298d9a0c58ad8dbcecaf83629...0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Improvements in System.Text.Json.Node.Tests.Perf_ParseThenWrite

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

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

| 83.38 μs | 78.47 μs | 0.94 | 0.08 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Node.Tests.Perf_ParseThenWrite*'
```

### System.Text.Json.Node.Tests.Perf_ParseThenWrite.ParseThenWrite(IsDataIndented: True, TestCase: DeepTree)

#### 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 | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [461fd2adbf736b4298d9a0c58ad8dbcecaf83629](https://github.com/dotnet/runtime/commit/461fd2adbf736b4298d9a0c58ad8dbcecaf83629)
Compare | [0d1a20fb14109f277df06ebee3f83c964f9dcc61](https://github.com/dotnet/runtime/commit/0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Diff | [Diff](https://github.com/dotnet/runtime/compare/461fd2adbf736b4298d9a0c58ad8dbcecaf83629...0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Improvements in System.Collections.CtorGivenSizeNonGeneric

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

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

| 263.36 ns | 225.76 ns | 0.86 | 0.60 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CtorGivenSizeNonGeneric*'
```

### System.Collections.CtorGivenSizeNonGeneric.ArrayList(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)

---

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [461fd2adbf736b4298d9a0c58ad8dbcecaf83629](https://github.com/dotnet/runtime/commit/461fd2adbf736b4298d9a0c58ad8dbcecaf83629)
Compare | [0d1a20fb14109f277df06ebee3f83c964f9dcc61](https://github.com/dotnet/runtime/commit/0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Diff | [Diff](https://github.com/dotnet/runtime/compare/461fd2adbf736b4298d9a0c58ad8dbcecaf83629...0d1a20fb14109f277df06ebee3f83c964f9dcc61)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Improvements in System.Numerics.Tests.Perf_Quaternion

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

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

| 17.70 ns | 12.49 ns | 0.71 | 0.12 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Numerics.Tests.Perf_Quaternion*'
```

### System.Numerics.Tests.Perf_Quaternion.CreateFromRotationMatrixBenchmark

#### 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 sources at src/benchmarks/micro/libraries/System.Text.Json/Node/ParseThenWrite.cs, System.Collections/Create/CtorGivenSizeNonGeneric.cs, and System.Numerics.Vectors/Perf_Quaternion.cs. Run the three provided benchmarks with benchmarks_ci.py and compare the reported arm64 results with the linked reports; done requires explaining or tracking the observed improvements.

Written by the indexing model from the issue text.