[Perf] Linux/arm64: 1 Improvement on 8/10/2026 1:11:36 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [98037590c8dd74cf65d3cde986af6d03ba0da2f3](https://github.com/dotnet/runtime/commit/98037590c8dd74cf65d3cde986af6d03ba0da2f3)
Compare | [60108ba66eb7d1d12f595480091b4ad80a24b172](https://github.com/dotnet/runtime/commit/60108ba66eb7d1d12f595480091b4ad80a24b172)
Diff | [Diff](https://github.com/dotnet/runtime/compare/98037590c8dd74cf65d3cde986af6d03ba0da2f3...60108ba66eb7d1d12f595480091b4ad80a24b172)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

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

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

• [ReadOnlyMemory - 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CopyTo*'
```

### System.Collections.CopyTo<String>.ReadOnlyMemory(Size: 2048)

#### 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 src/benchmarks/micro/libraries/System.Collections/CopyTo.cs at lines 48-50 and the benchmarking workflow linked in the issue. Run the provided benchmarks_ci.py command for System.Collections.CopyTo, then compare the reported baseline and test results. Done should mean the improvement is explained and any required runtime change is validated by the benchmark.

Written by the indexing model from the issue text.