[Perf] Windows/x86: 9 Regressions on 2/1/2026 8:48:47 AM +00:00

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#68,269 opened on Feb 1, 2026 1 comment 0 reactions 0 assignees View on GitHub

arch-x86 branch-10.0 kind-sdk_scenarios os-windows perf-regression untriaged

Dominant language: No language data
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 | [0b60d265d30d96c827b73dbce74cb78f600d3c92](https://github.com/dotnet/sdk/commit/0b60d265d30d96c827b73dbce74cb78f600d3c92)
Compare | [181f8798913e9c234e19756db58f38a8cac176ea](https://github.com/dotnet/sdk/commit/181f8798913e9c234e19756db58f38a8cac176ea)
Diff | [Diff](https://github.com/dotnet/sdk/compare/0b60d265d30d96c827b73dbce74cb78f600d3c92...181f8798913e9c234e19756db58f38a8cac176ea)
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]()

| 3392.49 ms | 3605.84 ms | 1.06 | 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 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

### Improvements in SDK F# Console Template Clean Build

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

[SDK F# Console Template Clean Build - Process Time]()
[ADX - Test Multi Config Graph]()

| 2561.66 ms | 2509.42 ms | 0.98 | 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 F# Console Template Clean Build*'
```

### SDK F# Console Template Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions 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]()

| 1824.99 ms | 2010.56 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 'Inner Loop Blazor Client*'
```

### Inner Loop Blazor Client

#### 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]()

| 421.45 ms | 376.19 ms | 0.89 | 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 MVC*'
```

### Inner Loop MVC

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK Console Template net8.0 Clean Build

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

[0 Clean Build - Process Time]()
[ADX - Test Multi Config Graph]()

| 2753.62 ms | 2813.75 ms | 1.02 | 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 Console Template net8.0 Clean Build*'
```

### SDK Console Template net8.0 Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK Class library Template Clean Build

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

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

| 2676.58 ms | 2771.51 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 Class library Template Clean Build*'
```

### SDK Class library Template Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SDK Console Template net10.0 Clean Build

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

[0 Clean Build - Process Time]()
[ADX - Test Multi Config Graph]()

| 2767.88 ms | 2835.39 ms | 1.02 | 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 Console Template net10.0 Clean Build*'
```

### SDK Console Template net10.0 Clean Build

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in Inner Loop Console

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

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

| 139.15 ms | 158.65 ms | 1.14 | 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 Console*'
```

### Inner Loop Console

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in SDK ASP.NET Core Web App Template Build(No Change)

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

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

| 1302.94 ms | 1268.70 ms | 0.97 | 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 Template Build(No Change)*'
```

### SDK ASP.NET Core Web App 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 benchmarking workflow linked in the issue. Re-run the listed SDK MSTest, F# Console, Blazor Client, and MVC filters on the Windows x86 configuration, then compare the baseline and compare commits and review the linked reports. Done means identifying and addressing the reported regressions with benchmark results showing whether they remain.

Written by the indexing model from the issue text.

Assessment

Tech stack: fsharp, python
Domain: build-system, performance, testing-qa
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Stale
Clarity: Needs clarification
Newbie friendliness: 25/100

[Perf] Windows/x86: 9 Regressions on 2/1/2026 8:48:47 AM +00:00

Description

Contributor guide

Research direction

Assessment

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