[Perf] Linux/x64: 8 Improvements on 12/2/2025 5:35:46 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [3871ff9b61e5278606e21d1624a1419d11384380](https://github.com/dotnet/runtime/commit/3871ff9b61e5278606e21d1624a1419d11384380)
Compare | [f204e02d03afb032f4221eae696800bcb766a778](https://github.com/dotnet/runtime/commit/f204e02d03afb032f4221eae696800bcb766a778)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3871ff9b61e5278606e21d1624a1419d11384380...f204e02d03afb032f4221eae696800bcb766a778)
Configs | CompilationMode:wasm, RunKind:micro

### Improvements in System.Text.Perf_Utf8Encoding

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

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

| 134.94 μs | 44.77 μs | 0.33 | 0.01 | False | | |
|

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

| 266.64 μs | 188.40 μs | 0.71 | 0.00 | False | | |
|

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

| 296.48 μs | 97.58 μs | 0.33 | 0.01 | False | | |
|

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

| 426.99 μs | 335.07 μs | 0.78 | 0.00 | False | | |
|

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

| 117.14 μs | 38.89 μs | 0.33 | 0.01 | False | | |
|

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

| 147.74 μs | 49.00 μs | 0.33 | 0.01 | False | | |
|

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

| 542.43 μs | 334.11 μs | 0.62 | 0.00 | False | | |
|

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

| 354.15 μs | 254.11 μs | 0.72 | 0.00 | False | | |

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[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.Text.Perf_Utf8Encoding*'
```

### System.Text.Perf_Utf8Encoding.GetByteCount(Input: Chinese)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetBytes(Input: Cyrillic)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetByteCount(Input: EnglishMostlyAscii)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetBytes(Input: Chinese)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetByteCount(Input: Cyrillic)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetByteCount(Input: Greek)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetBytes(Input: EnglishMostlyAscii)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Perf_Utf8Encoding.GetBytes(Input: Greek)

#### 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 System.Text.Perf_Utf8Encoding benchmark entries in src/benchmarks/micro/libraries/System.Text.Encoding/Perf.Utf8Encoding.cs and compare the linked baseline and test runs. Review the reported GetByteCount and GetBytes results for the wasm configuration; the issue does not define a specific change or acceptance test, so triage must establish what action is needed.

Written by the indexing model from the issue text.