[Perf] Windows/x86: 4 Improvements on 5/17/2026 2:49:51 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f595fa328e01cb429abe327f5d29156cfa4e007b](https://github.com/dotnet/runtime/commit/f595fa328e01cb429abe327f5d29156cfa4e007b)
Compare | [bb4ef64bceda7720966963cd9de4f334833b5f25](https://github.com/dotnet/runtime/commit/bb4ef64bceda7720966963cd9de4f334833b5f25)
Diff | [Diff](https://github.com/dotnet/runtime/compare/f595fa328e01cb429abe327f5d29156cfa4e007b...bb4ef64bceda7720966963cd9de4f334833b5f25)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.Perf_File

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

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

| 14363.83 μs | 949.37 μs | 0.07 | 0.70 | False | | |
|

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

| 397.08 μs | 293.23 μs | 0.74 | 0.27 | False | | |
|

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

| 38.17 μs | 29.63 μs | 0.78 | 0.59 | False | | |
|

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

| 46.59 ms | 39.31 ms | 0.84 | 0.29 | False | | |

![graph]()
![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.Perf_File*'
```

### System.IO.Tests.Perf_File.CopyTo(size: 1048576)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_File.ReadAllBytesAsync(size: 1048576)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_File.ReadAllBytesAsync(size: 4096)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_File.ReadAllBytesAsync(size: 104857600)

#### 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)