[Perf] Linux/arm64: 3 Improvements on 7/30/2026 11:32:15 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [0a25043f48f83ecfa896966929f25f792463344b](https://github.com/dotnet/runtime/commit/0a25043f48f83ecfa896966929f25f792463344b)
Compare | [efe647b7aa3928130fa2a24069a397d3b8c9cbe4](https://github.com/dotnet/runtime/commit/efe647b7aa3928130fa2a24069a397d3b8c9cbe4)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0a25043f48f83ecfa896966929f25f792463344b...efe647b7aa3928130fa2a24069a397d3b8c9cbe4)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_Uri

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

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

| 86.70 ns | 79.06 ns | 0.91 | 0.01 | False | | |
|

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

| 97.30 ns | 90.10 ns | 0.93 | 0.00 | False | | |
|

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

| 85.44 ns | 79.17 ns | 0.93 | 0.02 | False | | |

![graph]()
![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.Tests.Perf_Uri*'
```

### System.Tests.Perf_Uri.Ctor(input: "https://CONTOSO.com")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Uri.Ctor(input: "http://dot.net")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Uri.Ctor(input: "https://contoso.com")

#### 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.Runtime/Perf.Uri.cs#L58-L60 and the linked performance report. Run the provided benchmarks_ci.py command for System.Tests.Perf_Uri, then compare the ARM64 Ubuntu 22.04 results with the listed baseline and compare commits. Done means the improvement is reproduced and its follow-up action is documented.

Written by the indexing model from the issue text.