[Perf] Linux/x64: 5 Regressions on 6/10/2026 1:14:05 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [24547a76ba95bee359f4c0b58dd98976973aa797](https://github.com/dotnet/runtime/commit/24547a76ba95bee359f4c0b58dd98976973aa797)
Compare | [4b5614930561c7d0ae7b36b44ff0826fda04c49d](https://github.com/dotnet/runtime/commit/4b5614930561c7d0ae7b36b44ff0826fda04c49d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/24547a76ba95bee359f4c0b58dd98976973aa797...4b5614930561c7d0ae7b36b44ff0826fda04c49d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.CtorFromCollection<String>

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

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

| 584.82 μs | 866.39 μs | 1.48 | 0.27 | False | | |
|

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

| 931.96 μs | 1374.11 μs | 1.47 | 0.31 | False | | |
|

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

| 3.53 μs | 4.13 μs | 1.17 | 0.26 | False | | |
|

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

| 2.57 ms | 2.88 ms | 1.12 | 0.42 | False | | |
|

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

| 5.72 μs | 6.36 μs | 1.11 | 0.31 | False | | |

![graph]()
![graph]()
![graph]()
![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 'System.Collections.CtorFromCollection*'
```

### System.Collections.CtorFromCollection<String>.LinkedList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ImmutableList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ImmutableArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ConcurrentDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.Queue(Size: 512)

#### 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 benchmark command in the Repro section and inspect src/benchmarks/micro/libraries/System.Collections/Create/CtorFromCollection.cs at the linked lines for the affected collection constructors. Compare the baseline and test commits, using the profiling and benchmarking workflow docs and the linked report, until the five regressions are explained and the benchmark results are verified against the baseline.

Written by the indexing model from the issue text.