[Perf] Windows/x86: 2 Regressions on 1/24/2026 8:35:50 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [614b68725fd6d4678494c775eafea09bda82356f](https://github.com/dotnet/runtime/commit/614b68725fd6d4678494c775eafea09bda82356f)
Compare | [b19edc085666acaf215ff60edce24cada71e2f93](https://github.com/dotnet/runtime/commit/b19edc085666acaf215ff60edce24cada71e2f93)
Diff | [Diff](https://github.com/dotnet/runtime/compare/614b68725fd6d4678494c775eafea09bda82356f...b19edc085666acaf215ff60edce24cada71e2f93)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.ContainsKeyTrue<Int32, Int32>

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

• [SortedDictionary - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 11.42 μs | 12.81 μs | 1.12 | 0.06 | False | | |

[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 'System.Collections.ContainsKeyTrue*'
```

### System.Collections.ContainsKeyTrue<Int32, Int32>.SortedDictionary(Size: 512)

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [614b68725fd6d4678494c775eafea09bda82356f](https://github.com/dotnet/runtime/commit/614b68725fd6d4678494c775eafea09bda82356f)
Compare | [b19edc085666acaf215ff60edce24cada71e2f93](https://github.com/dotnet/runtime/commit/b19edc085666acaf215ff60edce24cada71e2f93)
Diff | [Diff](https://github.com/dotnet/runtime/compare/614b68725fd6d4678494c775eafea09bda82356f...b19edc085666acaf215ff60edce24cada71e2f93)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Net.Primitives.Tests.CredentialCacheTests

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

• [GetCredential_HostPort - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 5.09 ns | 8.13 ns | 1.60 | 0.53 | False | | |

[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 'System.Net.Primitives.Tests.CredentialCacheTests*'
```

### System.Net.Primitives.Tests.CredentialCacheTests.GetCredential_HostPort(host: "notfound", hostPortCount: 0)

#### 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 benchmark sources src/benchmarks/micro/libraries/System.Collections/Contains/ContainsKeyTrue.cs and src/benchmarks/micro/libraries/System.Net.Primitives/CredentialCacheTests.cs. Run the two supplied benchmarks using benchmarks_ci.py, then inspect the linked history and regression reports. Done means the reported x86 Windows regressions are explained and any result is validated against the baseline and compare commits.

Written by the indexing model from the issue text.