[Perf] Windows/x86: 5 Regressions on 1/24/2026 8:20:10 AM +00:00

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#67,846 opened on Jan 24, 2026 0 comments 0 reactions 0 assignees View on GitHub

arch-x86 branch-9.0 kind-sdk_scenarios os-windows perf-regression untriaged

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Stars: 10
Forks: 8
PR merge metrics: PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [72e782541cab0694c5cc018e4bc784245e22e6a1](https://github.com/dotnet/sdk/commit/72e782541cab0694c5cc018e4bc784245e22e6a1)
Compare | [1e311fe894a29d7e6b026f4dbefa2de2754eb2b3](https://github.com/dotnet/sdk/commit/1e311fe894a29d7e6b026f4dbefa2de2754eb2b3)
Diff | [Diff](https://github.com/dotnet/sdk/compare/72e782541cab0694c5cc018e4bc784245e22e6a1...1e311fe894a29d7e6b026f4dbefa2de2754eb2b3)
Configs | CompilationMode:tiered, RunKind:sdk_scenarios

### Regressions in SDK ASP.NET Core Web API Template Clean Build

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

[NET Core Web API Template Clean Build - Process Time]()
[ADX - Test Multi Config Graph]()

| 3599.44 ms | 3943.42 ms | 1.10 | 0.00 | True | | |

[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 'SDK ASP.NET Core Web API Template Clean Build*'
```

### SDK ASP.NET Core Web API Template Clean Build

#### 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 Inner Loop Blazor Client

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

[Inner Loop Blazor Client - Generic Startup Diff]()
[ADX - Test Multi Config Graph]()

| 1931.82 ms | 1758.78 ms | 0.91 | 0.00 | True | | |

[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 'Inner Loop Blazor Client*'
```

### Inner Loop Blazor Client

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in Inner Loop MsBuild Console

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

[Inner Loop MsBuild Console - Generic Startup Diff]()
[ADX - Test Multi Config Graph]()

| 167.24 ms | 178.34 ms | 1.07 | 0.00 | True | | |

[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 'Inner Loop MsBuild Console*'
```

### Inner Loop MsBuild Console

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK xUnit Test Project Template Clean Build

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

[SDK xUnit Test Project Template Clean Build - Process Time]()
[ADX - Test Multi Config Graph]()

| 3066.92 ms | 3176.45 ms | 1.04 | 0.00 | True | | |

[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 'SDK xUnit Test Project Template Clean Build*'
```

### SDK xUnit Test Project Template Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build

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

[NET Core Web App - Process Time]()
[ADX - Test Multi Config Graph]()

| 5044.11 ms | 129231.99 ms | 25.62 | 0.00 | True | | |

[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 'SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build*'
```

### SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with performance/scripts/benchmarks_ci.py and the benchmarking workflow linked in the issue, then reproduce the listed filters on Windows x86 using the reported baseline and compare commits. Review the SDK diff and benchmark reports for the five reported regressions; done means the regressions are explained and the appropriate follow-up is identified.

Written by the indexing model from the issue text.

Assessment

Tech stack: python
Domain: build-system, operating-systems, performance, testing-qa
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Stale
Clarity: Mostly clear
Newbie friendliness: 35/100

[Perf] Windows/x86: 5 Regressions on 1/24/2026 8:20:10 AM +00:00

Description

Contributor guide

Research direction

Assessment

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