[Perf] Windows/x64: 3 Regressions on 4/9/2026 7:19:09 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [ab2f538fca8e2d278e592da1dd6e6ad82954e91c](https://github.com/dotnet/runtime/commit/ab2f538fca8e2d278e592da1dd6e6ad82954e91c)
Compare | [cc78323ef440208bab9bd99fee82e3ea40ec61a5](https://github.com/dotnet/runtime/commit/cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ab2f538fca8e2d278e592da1dd6e6ad82954e91c...cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>

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

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

| 1.05 μs | 1.54 μs | 1.47 | 0.28 | False | | |
|

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

| 155.30 ns | 178.51 ns | 1.15 | 0.00 | 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.Tests.Perf_PriorityQueue*'
```

### System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>.K_Max_Elements(Size: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>.K_Max_Elements(Size: 100)

#### 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 | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [ab2f538fca8e2d278e592da1dd6e6ad82954e91c](https://github.com/dotnet/runtime/commit/ab2f538fca8e2d278e592da1dd6e6ad82954e91c)
Compare | [cc78323ef440208bab9bd99fee82e3ea40ec61a5](https://github.com/dotnet/runtime/commit/cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ab2f538fca8e2d278e592da1dd6e6ad82954e91c...cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.Perf_Frozen<NotKnownComparable>

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

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

| 14.50 μs | 15.63 μs | 1.08 | 0.18 | 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.Perf_Frozen*'
```

### System.Collections.Perf_Frozen<NotKnownComparable>.ToFrozenDictionary(Count: 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)