[Perf] Windows/x64: 2 Regressions on 8/12/2026 9:02:09 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [283314d5d7f2d77d1a31087ec962a4c407106445](https://github.com/dotnet/sdk/commit/283314d5d7f2d77d1a31087ec962a4c407106445)
Compare | [f5782bfe7cbe62e23058d578aa2216269b0ad34a](https://github.com/dotnet/sdk/commit/f5782bfe7cbe62e23058d578aa2216269b0ad34a)
Diff | [Diff](https://github.com/dotnet/sdk/compare/283314d5d7f2d77d1a31087ec962a4c407106445...f5782bfe7cbe62e23058d578aa2216269b0ad34a)
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]()

| 1070.83 ms | 1118.92 ms | 1.04 | 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 | [283314d5d7f2d77d1a31087ec962a4c407106445](https://github.com/dotnet/sdk/commit/283314d5d7f2d77d1a31087ec962a4c407106445)
Compare | [f5782bfe7cbe62e23058d578aa2216269b0ad34a](https://github.com/dotnet/sdk/commit/f5782bfe7cbe62e23058d578aa2216269b0ad34a)
Diff | [Diff](https://github.com/dotnet/sdk/compare/283314d5d7f2d77d1a31087ec962a4c407106445...f5782bfe7cbe62e23058d578aa2216269b0ad34a)
Configs | CompilationMode:tiered, RunKind:scenarios

### Improvements 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]()

| 949.33 ms | 926.04 ms | 0.98 | 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)

Start with the dotnet/performance benchmarking workflow and reproduce the named WinForms and PaintDotNet filters using scripts/benchmarks_ci.py. Compare the baseline and test commits and inspect the linked benchmark and test reports to isolate the startup regression; done means the regression is explained and the affected benchmark returns to baseline.

Written by the indexing model from the issue text.