[Perf] Linux/x64: 1 Improvement on 8/11/2026 4:34:13 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [b470543f2f101c83205ac0a0e008c934be9774db](https://github.com/dotnet/runtime/commit/b470543f2f101c83205ac0a0e008c934be9774db)
Compare | [1fdccbc9c3690a80a9579bdc0e9be997db1ac0de](https://github.com/dotnet/runtime/commit/1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b470543f2f101c83205ac0a0e008c934be9774db...1fdccbc9c3690a80a9579bdc0e9be997db1ac0de)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

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

![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.AddGivenSize*'
```

### System.Collections.AddGivenSize<String>.ObservableCollection(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 linked System.Collections.AddGivenSize benchmark source in dotnet/performance/src/benchmarks/micro/libraries/System.Collections/Add/AddGivenSize.cs and the benchmarking workflow documentation. Run the provided benchmarks_ci.py command, then compare the baseline and test reports. Done means the reported improvement is reproduced and its cause or relevant runtime change is identified.

Written by the indexing model from the issue text.