[Perf] Windows/x86: 1 Regression on 6/21/2026 2:47:11 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [e556d5a7e0e7f3682eea7ce544b29c6f6c75a216](https://github.com/dotnet/runtime/commit/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216)
Compare | [06b80b7dccace56abf56e91e72ee26c2a682b76e](https://github.com/dotnet/runtime/commit/06b80b7dccace56abf56e91e72ee26c2a682b76e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e556d5a7e0e7f3682eea7ce544b29c6f6c75a216...06b80b7dccace56abf56e91e72ee26c2a682b76e)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Compression.ZLib

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

• [Compress - Duration of single invocation]()
• [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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Compression.ZLib*'
```

### System.IO.Compression.ZLib.Compress(level: Fastest, file: "sum")

#### 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.IO.Compression.ZLib.Compress benchmark and run scripts/benchmarks_ci.py using the documented command and filter. Compare the baseline and test commits and review the linked performance report; done means the regression's cause is identified and the benchmark no longer shows the reported slowdown.

Written by the indexing model from the issue text.