[Perf] Linux/arm64: 2 Improvements on 6/18/2026 11:30:22 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [58d1b48b6d2573b77906036880082c1be0766f63](https://github.com/dotnet/sdk/commit/58d1b48b6d2573b77906036880082c1be0766f63)
Compare | [93304cdf8a80ce5f1ce0b3201820ab374bab019c](https://github.com/dotnet/sdk/commit/93304cdf8a80ce5f1ce0b3201820ab374bab019c)
Diff | [Diff](https://github.com/dotnet/sdk/compare/58d1b48b6d2573b77906036880082c1be0766f63...93304cdf8a80ce5f1ce0b3201820ab374bab019c)
Configs | CompilationMode:tiered, RunKind:fsharpmicro

### Improvements in MicroBenchmarks.FSharp.Collections+CollectionsBenchmark

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

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

| 11.39 ns | 8.55 ns | 0.75 | 0.19 | False | | |
|

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

| 11.39 ns | 8.55 ns | 0.75 | 0.19 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'MicroBenchmarks.FSharp.Collections+CollectionsBenchmark*'
```

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ListRemoveManyAtBeginning(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ListRemoveManyAtBeginning(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 scripts/benchmarks_ci.py and run the documented filter for MicroBenchmarks.FSharp.Collections+CollectionsBenchmark. Compare the reported ListRemoveManyAtBeginning results with the linked benchmark report and inspect the corresponding performance code; done means the improvement is reproduced and its cause or actionable code location is established.

Written by the indexing model from the issue text.