[Perf] Windows/x64: 3 Improvements on 7/7/2026 8:36:41 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [079b4572b83e3b66031899e6bf3842e1b4da7231](https://github.com/dotnet/runtime/commit/079b4572b83e3b66031899e6bf3842e1b4da7231)
Compare | [5568a01aa964e9f6784490f9359135cc36d021fa](https://github.com/dotnet/runtime/commit/5568a01aa964e9f6784490f9359135cc36d021fa)
Diff | [Diff](https://github.com/dotnet/runtime/compare/079b4572b83e3b66031899e6bf3842e1b4da7231...5568a01aa964e9f6784490f9359135cc36d021fa)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.StreamReaderReadLineTests

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

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

| 296.09 μs | 258.24 μs | 0.87 | 0.06 | False | | |
|

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

| 228.94 μs | 203.07 μs | 0.89 | 0.07 | False | | |
|

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

| 11.84 μs | 11.19 μs | 0.94 | 0.03 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.StreamReaderReadLineTests*'
```

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 0, 0])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 1, 1])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 33, 128])

#### 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 by running the provided benchmarks_ci.py command from the dotnet/performance repository and review the linked StreamReaderReadLineTests.cs benchmark source. The report identifies improvements but does not name a runtime implementation file, proposed change, or concrete completion criteria; done would require investigating the measured behavior and validating any resulting change with the benchmark.

Written by the indexing model from the issue text.