[Perf] Windows/x64: 2 Improvements on 2/11/2026 4:18:47 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e](https://github.com/dotnet/runtime/commit/6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e)
Compare | [92741bebcae5b82cd537979eef962674627e7f89](https://github.com/dotnet/runtime/commit/92741bebcae5b82cd537979eef962674627e7f89)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e...92741bebcae5b82cd537979eef962674627e7f89)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

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

| 107.70 μs | 98.93 μs | 0.92 | 0.03 | 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.IO.Tests.StreamReaderReadLineTests*'
```

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

#### 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 | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e](https://github.com/dotnet/runtime/commit/6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e)
Compare | [92741bebcae5b82cd537979eef962674627e7f89](https://github.com/dotnet/runtime/commit/92741bebcae5b82cd537979eef962674627e7f89)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6641d63f5e8e4878ee1ca5a0ca1a448a36449e0e...92741bebcae5b82cd537979eef962674627e7f89)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_String

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

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

| 2.21 μs | 2.09 μs | 0.94 | 0.03 | 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.Tests.Perf_String*'
```

### System.Tests.Perf_String.Concat_CharEnumerable

#### 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)