[Perf] Windows/x64: 2 Regressions on 9/15/2026 12:30:14 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd](https://github.com/dotnet/sdk/commit/4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd)
Compare | [1c83110633092213f4f794b69557f885a96e7a08](https://github.com/dotnet/sdk/commit/1c83110633092213f4f794b69557f885a96e7a08)
Diff | [Diff](https://github.com/dotnet/sdk/compare/4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd...1c83110633092213f4f794b69557f885a96e7a08)
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]()

| 1055.49 ms | 1194.09 ms | 1.13 | 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 | [4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd](https://github.com/dotnet/sdk/commit/4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd)
Compare | [1c83110633092213f4f794b69557f885a96e7a08](https://github.com/dotnet/sdk/commit/1c83110633092213f4f794b69557f885a96e7a08)
Diff | [Diff](https://github.com/dotnet/sdk/compare/4a0529b48b6bb6f0a7a5a24b588c5097efaf0cfd...1c83110633092213f4f794b69557f885a96e7a08)
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]()

| 912.99 ms | 1028.21 ms | 1.13 | 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 linked baseline/compare commits, benchmark reports, and the performance repository's docs/benchmarking-workflow-dotnet-runtime.md. Run the two listed benchmarks with benchmarks_ci.py and compare the WinForms and PaintDotNet startup results. Done means identifying and addressing the cause of both reported regressions, then confirming the benchmarks no longer regress.

Written by the indexing model from the issue text.