[Perf] Windows/x64: 3 Improvements on 12/10/2025 5:38:36 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [b54c5d53ca8208e9bb5c95a2fbbd27f30df09b9d](https://github.com/dotnet/runtime/commit/b54c5d53ca8208e9bb5c95a2fbbd27f30df09b9d)
Compare | [3bb51cad730e0346e684e5815b3d19d99e42a7cb](https://github.com/dotnet/runtime/commit/3bb51cad730e0346e684e5815b3d19d99e42a7cb)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b54c5d53ca8208e9bb5c95a2fbbd27f30df09b9d...3bb51cad730e0346e684e5815b3d19d99e42a7cb)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.Perf_LengthBucketsFrozenDictionary

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

• [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
• [ADX - Test Multi Config Graph]()

| 1.10 μs | 1.04 μs | 0.94 | 0.02 | False | | |

![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 'System.Collections.Perf_LengthBucketsFrozenDictionary*'
```

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 1000, ItemsPerBucket: 5)

#### 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 | [726b3dffc2efd466b6cb8526d4a1c96cc0d6a852](https://github.com/dotnet/runtime/commit/726b3dffc2efd466b6cb8526d4a1c96cc0d6a852)
Compare | [8dbca2cd19e608d45f13b8f193299dd2fe52d3b3](https://github.com/dotnet/runtime/commit/8dbca2cd19e608d45f13b8f193299dd2fe52d3b3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/726b3dffc2efd466b6cb8526d4a1c96cc0d6a852...8dbca2cd19e608d45f13b8f193299dd2fe52d3b3)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in Benchstone.BenchI.IniArray

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

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

| 73.51 ms | 52.52 ms | 0.71 | 0.49 | False | | |

![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 'Benchstone.BenchI.IniArray*'
```

### Benchstone.BenchI.IniArray.Test

#### 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 | [726b3dffc2efd466b6cb8526d4a1c96cc0d6a852](https://github.com/dotnet/runtime/commit/726b3dffc2efd466b6cb8526d4a1c96cc0d6a852)
Compare | [8dbca2cd19e608d45f13b8f193299dd2fe52d3b3](https://github.com/dotnet/runtime/commit/8dbca2cd19e608d45f13b8f193299dd2fe52d3b3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/726b3dffc2efd466b6cb8526d4a1c96cc0d6a852...8dbca2cd19e608d45f13b8f193299dd2fe52d3b3)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Memory.Span<Char>

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

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

| 6.41 ns | 4.91 ns | 0.77 | 0.23 | False | | |

![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 'System.Memory.Span*'
```

### System.Memory.Span<Char>.LastIndexOfValue(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)