[Perf] Linux/x64: 3 Improvements on 8/19/2026 2:54:37 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [029a98f26a9506810140781e88ccb8e45de1cc79](https://github.com/dotnet/runtime/commit/029a98f26a9506810140781e88ccb8e45de1cc79)
Compare | [361539de30ffe5c5ccb7cbdfa230747411ec7faf](https://github.com/dotnet/runtime/commit/361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/029a98f26a9506810140781e88ccb8e45de1cc79...361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Improvements in System.Collections.CtorDefaultSize<String>

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

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

| 15.07 ns | 13.80 ns | 0.92 | 0.10 | 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.CtorDefaultSize*'
```

### System.Collections.CtorDefaultSize<String>.List

#### 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 | [029a98f26a9506810140781e88ccb8e45de1cc79](https://github.com/dotnet/runtime/commit/029a98f26a9506810140781e88ccb8e45de1cc79)
Compare | [361539de30ffe5c5ccb7cbdfa230747411ec7faf](https://github.com/dotnet/runtime/commit/361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/029a98f26a9506810140781e88ccb8e45de1cc79...361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

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

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

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

| 22.61 μs | 20.96 μs | 0.93 | 0.10 | 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.TryGetValueFalse*'
```

### System.Collections.TryGetValueFalse<Int32, Int32>.OrderedDictionary(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 | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [029a98f26a9506810140781e88ccb8e45de1cc79](https://github.com/dotnet/runtime/commit/029a98f26a9506810140781e88ccb8e45de1cc79)
Compare | [361539de30ffe5c5ccb7cbdfa230747411ec7faf](https://github.com/dotnet/runtime/commit/361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Diff | [Diff](https://github.com/dotnet/runtime/compare/029a98f26a9506810140781e88ccb8e45de1cc79...361539de30ffe5c5ccb7cbdfa230747411ec7faf)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Improvements in System.Collections.CtorDefaultSize<Int32>

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

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

| 15.22 ns | 13.96 ns | 0.92 | 0.09 | 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.CtorDefaultSize*'
```

### System.Collections.CtorDefaultSize<Int32>.List

#### 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 linked benchmark sources in src/benchmarks/micro/libraries/System.Collections/Create/CtorDefaultSize.cs and reproduce the three reported runs using scripts/benchmarks_ci.py with the listed filters. Compare the baseline and test reports for the wasm AOT configuration; completion would require identifying and addressing the performance behavior, then confirming it with the benchmark reports.

Written by the indexing model from the issue text.