[Perf] Windows/x86: 22 Improvements on 5/7/2026 3:57:15 PM +00:00

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#72,765 opened on May 12, 2026 1 comment 0 reactions 0 assignees View on GitHub

arch-x86 branch-refs/heads/main compilationmode-tiered kind-micro os-windows perf-improvement runkind-micro runtime-coreclr untriaged

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Forks: 8
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b](https://github.com/dotnet/runtime/commit/cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b)
Compare | [c3caf4d3163c429efbdefe7756a71702e9e6c982](https://github.com/dotnet/runtime/commit/c3caf4d3163c429efbdefe7756a71702e9e6c982)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b...c3caf4d3163c429efbdefe7756a71702e9e6c982)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.Perf_Ascii

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

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

| 15.73 ns | 5.19 ns | 0.33 | 0.02 | False | | |
|

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

| 15.74 ns | 5.24 ns | 0.33 | 0.01 | False | | |
|

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

| 16.00 ns | 5.45 ns | 0.34 | 0.01 | False | | |
|

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

| 16.00 ns | 5.46 ns | 0.34 | 0.01 | False | | |
|

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

| 7.15 ns | 4.09 ns | 0.57 | 0.09 | False | | |
|

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

| 6.83 ns | 4.10 ns | 0.60 | 0.08 | False | | |
|

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

| 6.29 ns | 4.10 ns | 0.65 | 0.24 | False | | |
|

[ToUtf16 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 6.01 ns | 4.10 ns | 0.68 | 0.01 | False | | |
|

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

| 6.29 ns | 5.12 ns | 0.82 | 0.12 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![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.Text.Perf_Ascii*'
```

### System.Text.Perf_Ascii.ToLower_Bytes(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToUpper_Bytes(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToUpper_Bytes_Chars(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToLower_Bytes_Chars(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToUpperInPlace_Bytes(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToLowerInPlace_Bytes(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToUpperInPlace_Chars(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToUtf16(Size: 6)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Ascii.ToLowerInPlace_Chars(Size: 6)

#### 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

### Improvements in System.Tests.Perf_Type

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

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

| 66.29 ns | 50.02 ns | 0.75 | 0.11 | False | | |
|

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

| 149.64 ns | 133.78 ns | 0.89 | 0.05 | False | | |
|

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

| 152.49 ns | 136.94 ns | 0.90 | 0.04 | 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.Tests.Perf_Type*'
```

### System.Tests.Perf_Type.GetType_Resolvers(input: typeof(int))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Type.GetType_Resolvers(input: typeof(System.Tests.Nested))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Type.GetType_Resolvers(input: typeof(System.Int32[]))

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Perf_Convert

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

[ToBase64String - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 577.80 ns | 324.85 ns | 0.56 | 0.02 | False | | |
|

[ToBase64CharArray - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 518.85 ns | 334.62 ns | 0.64 | 0.03 | False | | |

![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.Perf_Convert*'
```

### System.Perf_Convert.ToBase64String(formattingOptions: InsertLineBreaks)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64CharArray(binaryDataSize: 1024, formattingOptions: InsertLineBreaks)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [06ca6751830996c1c815bfdd73a3fb4c8b53d77f](https://github.com/dotnet/runtime/commit/06ca6751830996c1c815bfdd73a3fb4c8b53d77f)
Compare | [c3caf4d3163c429efbdefe7756a71702e9e6c982](https://github.com/dotnet/runtime/commit/c3caf4d3163c429efbdefe7756a71702e9e6c982)
Diff | [Diff](https://github.com/dotnet/runtime/compare/06ca6751830996c1c815bfdd73a3fb4c8b53d77f...c3caf4d3163c429efbdefe7756a71702e9e6c982)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Xml.Linq.Perf_XElement

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

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

| 44.63 ns | 32.57 ns | 0.73 | 0.02 | False | | |
|

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

| 44.43 ns | 33.45 ns | 0.75 | 0.05 | False | | |

![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.Xml.Linq.Perf_XElement*'
```

### System.Xml.Linq.Perf_XElement.CreateElementWithNamespace

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Xml.Linq.Perf_XElement.GetElementWithNamespace

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Xml.Linq.Perf_XName

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

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

| 36.80 ns | 28.70 ns | 0.78 | 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.Xml.Linq.Perf_XName*'
```

### System.Xml.Linq.Perf_XName.CreateElementWithNamespaceImplicitOperator

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Text.Json.Document.Tests.Perf_ParseThenWrite

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

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

| 2.81 μs | 2.57 μs | 0.91 | 0.01 | 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.Text.Json.Document.Tests.Perf_ParseThenWrite*'
```

### System.Text.Json.Document.Tests.Perf_ParseThenWrite.ParseThenWrite(IsDataIndented: False, TestCase: LotsOfStrings)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Text.Json.Serialization.Tests.WriteJson<SimpleStructWithProperties>

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

[SerializeToUtf8Bytes - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 83.89 ns | 78.60 ns | 0.94 | 0.02 | 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.Text.Json.Serialization.Tests.WriteJson*'
```

### System.Text.Json.Serialization.Tests.WriteJson<SimpleStructWithProperties>.SerializeToUtf8Bytes(Mode: SourceGen)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Tests.Perf_Int128

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

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

| 145.07 ns | 105.79 ns | 0.73 | 0.01 | 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_Int128*'
```

### System.Tests.Perf_Int128.TryFormat(value: 170141183460469231731687303715884105727)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Tests.Perf_Version

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

[TryParse4 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 32.13 ns | 30.25 ns | 0.94 | 0.01 | 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_Version*'
```

### System.Tests.Perf_Version.TryParse4

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Net.Primitives.Tests.CredentialCacheTests

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

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

| 551.95 ns | 504.10 ns | 0.91 | 0.02 | 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.Net.Primitives.Tests.CredentialCacheTests*'
```

### System.Net.Primitives.Tests.CredentialCacheTests.GetCredential_Uri(uriString: "http://name5", uriCount: 10)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

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[Perf] Windows/x86: 22 Improvements on 5/7/2026 3:57:15 PM +00:00

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