[Perf] Windows/x86: 6 Regressions on 8/26/2026 9:27:32 AM +00:00

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#78,503 opened on Aug 26, 2026 1 comment 0 reactions 0 assignees View on GitHub

arch-x86 branch-11.0 compilationmode-tiered kind-sdk_scenarios Look Again os-windows perf-regression runkind-sdk_scenarios 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 | [c545c4e3f9e2ebc10c6b3e2626187e18569adcf2](https://github.com/dotnet/sdk/commit/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2)
Compare | [4c748e02ce5e52a5e2a3ea1169f97705723b6c1a](https://github.com/dotnet/sdk/commit/4c748e02ce5e52a5e2a3ea1169f97705723b6c1a)
Diff | [Diff](https://github.com/dotnet/sdk/compare/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2...4c748e02ce5e52a5e2a3ea1169f97705723b6c1a)
Configs | CompilationMode:tiered, RunKind:sdk_scenarios

### Regressions in SDK MSTest Test Project (.NET Core) Template Clean Build

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

[SDK MSTest Test Project - Process Time]()
[ADX - Test Multi Config Graph]()

| 2703.13 ms | 3084.01 ms | 1.14 | 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 'SDK MSTest Test Project (.NET Core) Template Clean Build*'
```

### SDK MSTest Test Project (.NET Core) 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

### Regressions in SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)

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]()

| 463.91 ms | 479.54 ms | 1.03 | 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 'SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)*'
```

### SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)

#### 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]()

| 797.98 ms | 854.80 ms | 1.07 | 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 'Inner Loop MsBuild Console*'
```

### Inner Loop MsBuild Console

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in Inner Loop MVC

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

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

| 1382.48 ms | 1348.79 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 'Inner Loop MVC*'
```

### Inner Loop MVC

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK xUnit Test Project Template Build(No Change)

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

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

| 336.77 ms | 433.41 ms | 1.29 | 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 'SDK xUnit Test Project Template Build(No Change)*'
```

### SDK xUnit Test Project Template Build(No Change)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK ASP.NET Core Web API Template Build(No Change)

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

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

| 418.96 ms | 455.08 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 'SDK ASP.NET Core Web API Template Build(No Change)*'
```

### SDK ASP.NET Core Web API Template Build(No Change)

#### 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 provided benchmark filters, then compare the baseline and test commits and review the linked performance reports. Reproduce the Windows x86 regressions and trace them to the relevant change; done means the cause is identified, an appropriate fix is verified, and the affected benchmarks no longer regress.

Written by the indexing model from the issue text.

Assessment

Tech stack: git, python
Domain: operating-systems, performance, testing-qa
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Active
Clarity: Needs clarification
Newbie friendliness: 35/100

[Perf] Windows/x86: 6 Regressions on 8/26/2026 9:27:32 AM +00:00

Description

Contributor guide

Research direction

Assessment

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