[Perf] Windows/x64: 18 Improvements on 6/12/2026 1:25:17 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [2f3821520acb47a26220fe08ee13cb89b3a38572](https://github.com/dotnet/runtime/commit/2f3821520acb47a26220fe08ee13cb89b3a38572)
Compare | [f8676279408d3721fe4b02afc035a8851d303e57](https://github.com/dotnet/runtime/commit/f8676279408d3721fe4b02afc035a8851d303e57)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2f3821520acb47a26220fe08ee13cb89b3a38572...f8676279408d3721fe4b02afc035a8851d303e57)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.IO.Tests.Perf_FileStream

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201048576%2c%20userBufferSize%3a%20512%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1621.57 μs | 875.66 μs | 0.54 | 0.14 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201048576%2c%20userBufferSize%3a%204096%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1575.23 μs | 851.76 μs | 0.54 | 0.14 | False | | |
|<ul><li>[Read_NoBuffering - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize%3a%201048576%2c%20userBufferSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L204-#L207>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 430.92 μs | 244.77 μs | 0.57 | 0.16 | False | | |
|<ul><li>[Flush - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Flush(fileSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L396-#L410>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACl2R244TMQyG71fqO5jepBWznWnZLdWgSCx7YBFagdoKLlGYeDpGOYwSh205vDtKp73hxlZ+23++xAYZGCODhLdic4iMdvbh02yLkePsM4b22wMZ3HBAZWcPJsVu0maBfmEN82pxVYDvmbyLNdzEg2u64J1PcSrejC4MMqiWMYAErRiZLE4W1WJ5WV1dzpfbalXPF/Wr5ex68Xq1ml+/rKq6qqanyYC9BwlCe3bIZUguz599vwflmi7XA7ax7FDpWFpF7tzQeNfSLt98cMpSM/ktbr3tyaiM++Q1ihoEEwbUogCxTu4jOZ1FS03w4m8GeY/8SJF9oEaZO8XqK3GXfVSg6F2c5M+TORTDU+UxFkd6mUNxQpVDKk5gckjT0cUfeO4wIKyTeySt0YGU0CoTMdf64H9gw7DBQBgLeJfI6C1Z3LCyfQFflEko875ufXKMYY0xGb75iUHtcHRRlmf/wQFeNN6xIhdhPGZ/v29M0jgeQ1nC/V7Z3iD4FloyjIHcDnxiUBCPwxkooNMYIO+i6VRgeCbuYDI0yDPmvvEmWSf/xz0MepRH7gL2TGxQijvFKAo4nI5PqGIKaNGxmP4DG2pFT6QCAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 6.41 ms | 3.64 ms | 0.57 | 0.25 | False | | |
|<ul><li>[Write - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Write(fileSize%3a%201048576%2c%20userBufferSize%3a%20512%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L225-#L228>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.96 ms | 1.28 ms | 0.65 | 0.48 | False | | |
|<ul><li>[Write - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Write(fileSize%3a%201048576%2c%20userBufferSize%3a%204096%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L225-#L228>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.85 ms | 1.22 ms | 0.66 | 0.23 | False | | |
|<ul><li>[Write_NoBuffering - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Write_NoBuffering(fileSize%3a%201048576%2c%20userBufferSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L230-#L233>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 671.57 μs | 461.85 μs | 0.69 | 0.33 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%20104857600%2c%20userBufferSize%3a%204096%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 140.72 ms | 101.00 ms | 0.72 | 0.20 | False | | |
|<ul><li>[Read_NoBuffering - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize%3a%20104857600%2c%20userBufferSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L204-#L207>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 49.56 ms | 36.03 ms | 0.73 | 0.48 | False | | |
|<ul><li>[ReadByte - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.ReadByte(fileSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L141-#L156>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 20.28 μs | 16.92 μs | 0.83 | 0.08 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201024%2c%20userBufferSize%3a%201024%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 17.24 μs | 15.26 μs | 0.88 | 0.37 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_006.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_007.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_008.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_009.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_010.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream_011.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_FileStream.html>)

### 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_FileStream*'
```

<details>

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Flush(fileSize: 1024, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Write(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Write(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Write_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 104857600, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [2f3821520acb47a26220fe08ee13cb89b3a38572](https://github.com/dotnet/runtime/commit/2f3821520acb47a26220fe08ee13cb89b3a38572)
Compare | [f8676279408d3721fe4b02afc035a8851d303e57](https://github.com/dotnet/runtime/commit/f8676279408d3721fe4b02afc035a8851d303e57)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2f3821520acb47a26220fe08ee13cb89b3a38572...f8676279408d3721fe4b02afc035a8851d303e57)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.IO.Tests.Perf_RandomAccess

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ReadScatter - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize%3a%201048576%2c%20buffersSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L157-#L174>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1611.32 μs | 859.79 μs | 0.53 | 0.19 | False | | |
|<ul><li>[WriteGather - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.WriteGather(fileSize%3a%201048576%2c%20buffersSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L176-#L191>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.92 ms | 1.16 ms | 0.61 | 0.25 | False | | |
|<ul><li>[ReadScatter - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize%3a%20104857600%2c%20buffersSize%3a%2065536%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L157-#L174>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 51.07 ms | 36.38 ms | 0.71 | 0.49 | False | | |
|<ul><li>[Write - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.Write(fileSize%3a%201048576%2c%20bufferSize%3a%204096%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L94-#L108>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.94 ms | 1.39 ms | 0.72 | 0.30 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.Read(fileSize%3a%20104857600%2c%20bufferSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L76-#L92>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 49.53 ms | 39.65 ms | 0.80 | 0.46 | False | | |
|<ul><li>[Write - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.IO.Tests.Perf_RandomAccess.Write(fileSize%3a%20104857600%2c%20bufferSize%3a%2016384%2c%20options%3a%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.RandomAccess.cs#L94-#L108>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 59.98 ms | 50.29 ms | 0.84 | 0.32 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess_006.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.IO.Tests.Perf_RandomAccess.html>)

### 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_RandomAccess*'
```

<details>

### System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.WriteGather(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize: 104857600, buffersSize: 65536, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.Write(fileSize: 1048576, bufferSize: 4096, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.Read(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.Write(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [2f3821520acb47a26220fe08ee13cb89b3a38572](https://github.com/dotnet/runtime/commit/2f3821520acb47a26220fe08ee13cb89b3a38572)
Compare | [f8676279408d3721fe4b02afc035a8851d303e57](https://github.com/dotnet/runtime/commit/f8676279408d3721fe4b02afc035a8851d303e57)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2f3821520acb47a26220fe08ee13cb89b3a38572...f8676279408d3721fe4b02afc035a8851d303e57)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.Linq.Tests.Perf_ImmutableArrayExtensions

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[SequenceEqual - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows/System.Linq.Tests.Perf_ImmutableArrayExtensions.SequenceEqual(input%3a%20IEnumerable).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Linq/Perf.ImmutableArrayExtensions.cs#L29-#L32>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 72.36 ns | 59.54 ns | 0.82 | 0.02 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.Linq.Tests.Perf_ImmutableArrayExtensions_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/06_16_2026/refs/heads/main_x64_Windows%2010.0.22631/ViperWindows_Improvement/System.Linq.Tests.Perf_ImmutableArrayExtensions.html>)

### 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.Linq.Tests.Perf_ImmutableArrayExtensions*'
```

<details>

### System.Linq.Tests.Perf_ImmutableArrayExtensions.SequenceEqual(input: IEnumerable)

#### 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)

</details>

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	2f3821520acb47a26220fe08ee13cb89b3a38572
Compare	f8676279408d3721fe4b02afc035a8851d303e57
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1621.57 μs	875.66 μs	0.54	0.14	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1575.23 μs	851.76 μs	0.54	0.14	False
Read_NoBuffering - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	430.92 μs	244.77 μs	0.57	0.16	False
Flush - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	6.41 ms	3.64 ms	0.57	0.25	False
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.96 ms	1.28 ms	0.65	0.48	False
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.85 ms	1.22 ms	0.66	0.23	False
Write_NoBuffering - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	671.57 μs	461.85 μs	0.69	0.33	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	140.72 ms	101.00 ms	0.72	0.20	False
Read_NoBuffering - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	49.56 ms	36.03 ms	0.73	0.48	False
ReadByte - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	20.28 μs	16.92 μs	0.83	0.08	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	17.24 μs	15.26 μs	0.88	0.37	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
ReadScatter - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1611.32 μs	859.79 μs	0.53	0.19	False
WriteGather - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.92 ms	1.16 ms	0.61	0.25	False
ReadScatter - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	51.07 ms	36.38 ms	0.71	0.49	False
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.94 ms	1.39 ms	0.72	0.30	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	49.53 ms	39.65 ms	0.80	0.46	False
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	59.98 ms	50.29 ms	0.84	0.32	False

Uh oh!

[Perf] Windows/x64: 18 Improvements on 6/12/2026 1:25:17 PM +00:00 #74572

Description

Run Information

Improvements in System.IO.Tests.Perf_FileStream

Repro

System.IO.Tests.Perf_FileStream.Read(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Flush(fileSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Write(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Write(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Write_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read(fileSize: 104857600, userBufferSize: 4096, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Improvements in System.IO.Tests.Perf_RandomAccess

Repro

System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_RandomAccess.WriteGather(fileSize: 1048576, buffersSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_RandomAccess.ReadScatter(fileSize: 104857600, buffersSize: 65536, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_RandomAccess.Write(fileSize: 1048576, bufferSize: 4096, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_RandomAccess.Read(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_RandomAccess.Write(fileSize: 104857600, bufferSize: 16384, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

Docs

Run Information