[Perf] Windows/x64: 4 Regressions on 5/22/2026 8:28:12 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [3a62cc842c76761d4742f1d103892f19fd06dd3a](https://github.com/dotnet/sdk/commit/3a62cc842c76761d4742f1d103892f19fd06dd3a)
Compare | [5f66bab627b918f4a101caea5eebbe9321fbf9fe](https://github.com/dotnet/sdk/commit/5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Diff | [Diff](https://github.com/dotnet/sdk/compare/3a62cc842c76761d4742f1d103892f19fd06dd3a...5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Configs | CompilationMode:tiered, RunKind:scenarios

### Regressions in Startup - WinForms Large - FDD Publish

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

• [Startup - WinForms Large - FDD Publish - Generic Startup]()
• [ADX - Test Multi Config Graph]()

| 1081.82 ms | 1176.28 ms | 1.09 | 0.00 | True | | |

![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 'Startup - WinForms Large - FDD Publish*'
```

### Startup - WinForms Large - FDD Publish

#### 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 | [3a62cc842c76761d4742f1d103892f19fd06dd3a](https://github.com/dotnet/sdk/commit/3a62cc842c76761d4742f1d103892f19fd06dd3a)
Compare | [5f66bab627b918f4a101caea5eebbe9321fbf9fe](https://github.com/dotnet/sdk/commit/5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Diff | [Diff](https://github.com/dotnet/sdk/compare/3a62cc842c76761d4742f1d103892f19fd06dd3a...5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Configs | CompilationMode:tiered, RunKind:scenarios

### Improvements in Startup - PaintDotNet - FDD Publish

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

• [Startup - PaintDotNet - FDD Publish - Generic Startup]()
• [ADX - Test Multi Config Graph]()

| 1066.57 ms | 984.66 ms | 0.92 | 0.00 | True | | |

![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 'Startup - PaintDotNet - FDD Publish*'
```

### Startup - PaintDotNet - FDD Publish

#### 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 | [3a62cc842c76761d4742f1d103892f19fd06dd3a](https://github.com/dotnet/sdk/commit/3a62cc842c76761d4742f1d103892f19fd06dd3a)
Compare | [5f66bab627b918f4a101caea5eebbe9321fbf9fe](https://github.com/dotnet/sdk/commit/5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Diff | [Diff](https://github.com/dotnet/sdk/compare/3a62cc842c76761d4742f1d103892f19fd06dd3a...5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Configs | CompilationMode:tiered, RunKind:scenarios

### Regressions in Startup - PaintDotNet - FDD Publish - Affinity 85

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

• [Startup - PaintDotNet - FDD Publish - Affinity 85 - Generic Startup]()
• [ADX - Test Multi Config Graph]()

| 917.81 ms | 936.92 ms | 1.02 | 0.00 | True | | |

![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 'Startup - PaintDotNet - FDD Publish - Affinity 85*'
```

### Startup - PaintDotNet - FDD Publish - Affinity 85

#### 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 | [3a62cc842c76761d4742f1d103892f19fd06dd3a](https://github.com/dotnet/sdk/commit/3a62cc842c76761d4742f1d103892f19fd06dd3a)
Compare | [5f66bab627b918f4a101caea5eebbe9321fbf9fe](https://github.com/dotnet/sdk/commit/5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Diff | [Diff](https://github.com/dotnet/sdk/compare/3a62cc842c76761d4742f1d103892f19fd06dd3a...5f66bab627b918f4a101caea5eebbe9321fbf9fe)
Configs | CompilationMode:tiered, RunKind:scenarios

### Regressions in Startup - Static Winforms Template - FDD Publish

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

• [Startup - Static Winforms Template - FDD Publish - Generic Startup]()
• [ADX - Test Multi Config Graph]()

| 83.75 ms | 88.41 ms | 1.06 | 0.00 | True | | |

![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 'Startup - Static Winforms Template - FDD Publish*'
```

### Startup - Static Winforms Template - FDD Publish

#### 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 comparing the Baseline and Compare commits, then run the listed benchmarks with scripts/benchmarks_ci.py using the provided filters. Review the linked performance reports and profiling workflow; done means the four Windows/x64 startup regressions are reproduced, explained, and validated after a follow-up change or disposition.

Written by the indexing model from the issue text.