[Perf] Linux/x64: 2 Improvements on 6/22/2026 9:59:16 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [e556d5a7e0e7f3682eea7ce544b29c6f6c75a216](https://github.com/dotnet/runtime/commit/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Tests.Perf_Char

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

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

| 8.45 ns | 6.58 ns | 0.78 | 0.20 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_Char*'
```

### System.Tests.Perf_Char.Char_ToLowerInvariant(input: "Hello World!")

#### 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 | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [e556d5a7e0e7f3682eea7ce544b29c6f6c75a216](https://github.com/dotnet/runtime/commit/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.TryGetValueTrue<Int32, Int32>

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

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

| 1.18 μs | 1.03 μs | 0.87 | 0.01 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.TryGetValueTrue*'
```

### System.Collections.TryGetValueTrue<Int32, Int32>.FrozenDictionaryOptimized(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)

Start with the benchmark sources at src/benchmarks/micro/libraries/System.Runtime/Perf.Char.cs#L75-L85 and src/benchmarks/micro/libraries/System.Collections/TryGetValue/TryGetValueTrue.cs#L138-L147. Run the provided benchmarks_ci.py commands and inspect the linked reports and runtime commit diff. Done means confirming the reported measurements and identifying a concrete, reproducible runtime change; the issue does not specify one.

Written by the indexing model from the issue text.