[Perf] Windows/x64: 2 Improvements on 3/28/2026 5:46:01 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [a1eb7b3e52860862ffd38e139053b66f9d10d4f6](https://github.com/dotnet/runtime/commit/a1eb7b3e52860862ffd38e139053b66f9d10d4f6)
Compare | [ff21bcd829cb8ed24b3a0de8eee8800b7fe6fa3c](https://github.com/dotnet/runtime/commit/ff21bcd829cb8ed24b3a0de8eee8800b7fe6fa3c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a1eb7b3e52860862ffd38e139053b66f9d10d4f6...ff21bcd829cb8ed24b3a0de8eee8800b7fe6fa3c)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Formats.Tar.Tests.Perf_TarWriter

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

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

| 381.48 ns | 337.42 ns | 0.88 | 0.15 | False | | |
|

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

| 362.91 ns | 333.58 ns | 0.92 | 0.14 | False | | |

[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 'System.Formats.Tar.Tests.Perf_TarWriter*'
```

### System.Formats.Tar.Tests.Perf_TarWriter.UstarTarEntry_WriteEntry_Async

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Formats.Tar.Tests.Perf_TarWriter.GnuTarEntry_WriteEntry_Async

#### 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)