[Perf] Linux/arm64: 2 Improvements on 7/19/2026 2:42:16 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [13c03a4a9a854291f77636b1e15038e65919e68b](https://github.com/dotnet/runtime/commit/13c03a4a9a854291f77636b1e15038e65919e68b)
Compare | [2515f972d25ec6ab5868f696273bd02a6275e273](https://github.com/dotnet/runtime/commit/2515f972d25ec6ab5868f696273bd02a6275e273)
Diff | [Diff](https://github.com/dotnet/runtime/compare/13c03a4a9a854291f77636b1e15038e65919e68b...2515f972d25ec6ab5868f696273bd02a6275e273)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in PerfLabTests.DelegatePerf

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

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

| 212.43 ms | 30.12 ms | 0.14 | 0.23 | False | | |
|

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

| 28.78 ms | 26.64 ms | 0.93 | 0.18 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'PerfLabTests.DelegatePerf*'
```

### PerfLabTests.DelegatePerf.MulticastDelegateCombineInvoke

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.DelegatePerf.MulticastDelegateInvoke(length: 1000)

#### 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 src/benchmarks/micro/runtime/perflab/DelegatePerf.cs at the linked benchmark ranges and run the provided benchmarks_ci.py command. Review the baseline/compare commits and the linked performance report to determine whether the reported delegate timing change needs investigation; done is not defined beyond triage of the two results.

Written by the indexing model from the issue text.