[Perf] Linux/x64: 1 Improvement on 9/3/2026 9:59:06 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [334cc5c43dfb4b6acab5052c15ee8b1631d069bc](https://github.com/dotnet/runtime/commit/334cc5c43dfb4b6acab5052c15ee8b1631d069bc)
Compare | [134de00ac5934568c582a35322ae16a228db430d](https://github.com/dotnet/runtime/commit/134de00ac5934568c582a35322ae16a228db430d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/334cc5c43dfb4b6acab5052c15ee8b1631d069bc...134de00ac5934568c582a35322ae16a228db430d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in PerfLabTests.CastingPerf

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

• [CheckArrayIsVariantGenericInterfaceReflection - 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 'PerfLabTests.CastingPerf*'
```

### PerfLabTests.CastingPerf.CheckArrayIsVariantGenericInterfaceReflection

#### 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 source in performance/src/benchmarks/micro/runtime/perflab/CastingPerf.cs#L431-L435, then run the provided benchmarks_ci.py command for PerfLabTests.CastingPerf. Compare the linked baseline and test reports to understand the CheckArrayIsVariantGenericInterfaceReflection result; the payload does not define a code change or acceptance test.

Written by the indexing model from the issue text.