[Perf] Windows/x64: 4 Regressions on 9/3/2026 2:37:18 PM +00:00

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#78,941 opened on Sep 3, 2026 1 comment 0 reactions 0 assignees View on GitHub

arch-x64 branch-11.0 compilationmode-tiered kind-scenarios Look Again os-windows perf-regression runkind-scenarios untriaged

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Forks: 8
PR merge metrics: PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [f8a811758057986566da27d06d8f03a7e5e226bf](https://github.com/dotnet/sdk/commit/f8a811758057986566da27d06d8f03a7e5e226bf)
Compare | [1fee94ef34a9c6e2e4cf4199d9a546ef8a2a927d](https://github.com/dotnet/sdk/commit/1fee94ef34a9c6e2e4cf4199d9a546ef8a2a927d)
Diff | [Diff](https://github.com/dotnet/sdk/compare/f8a811758057986566da27d06d8f03a7e5e226bf...1fee94ef34a9c6e2e4cf4199d9a546ef8a2a927d)
Configs | CompilationMode:tiered, RunKind:scenarios

### Improvements in Startup - Static F# Console Template - FDD Publish

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

[Startup - Static F# Console Template - FDD Publish - Time To Main]()
[ADX - Test Multi Config Graph]()

| 39.86 ms | 36.23 ms | 0.91 | 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 F# Console Template - FDD Publish*'
```

### Startup - Static F# Console 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)

---

### Run Information

### Regressions in Startup - Static VB Console Template - FDD Publish

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

[Startup - Static VB Console Template - FDD Publish - Time To Main]()
[ADX - Test Multi Config Graph]()

| 35.89 ms | 39.83 ms | 1.11 | 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 VB Console Template - FDD Publish*'
```

### Startup - Static VB Console Template - FDD Publish

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### 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]()

| 1049.06 ms | 1143.89 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

---

### Run Information

### 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]()

| 872.65 ms | 904.27 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 - PaintDotNet - FDD Publish - Affinity 85*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the linked benchmark reports and the baseline/compare SDK commits, then run performance/scripts/benchmarks_ci.py with the listed filters on Windows. Compare the four reported scenarios and inspect the relevant changes to determine which regression is actionable. Done means the cause is identified and the affected benchmark no longer regresses against the baseline.

Written by the indexing model from the issue text.

Assessment

Tech stack: fsharp, visualbasic
Domain: performance
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Active
Clarity: Needs clarification
Newbie friendliness: 30/100

[Perf] Windows/x64: 4 Regressions on 9/3/2026 2:37:18 PM +00:00

Description

Contributor guide

Research direction

Assessment

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