[Perf] Linux/x64: 2 Improvements on 7/28/2026 2:40:15 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [00115f085a2df36ea7b135673d290298e20775f7](https://github.com/dotnet/runtime/commit/00115f085a2df36ea7b135673d290298e20775f7)
Compare | [975877333c98d9d08bad66670d74accc6047be34](https://github.com/dotnet/runtime/commit/975877333c98d9d08bad66670d74accc6047be34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/00115f085a2df36ea7b135673d290298e20775f7...975877333c98d9d08bad66670d74accc6047be34)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in MicroBenchmarks.Serializers.Json_FromString<MyEventsListerViewModel>

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

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

| 67.47 ms | 57.91 ms | 0.86 | 0.18 | False | | |

![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.Serializers.Json_FromString*'
```

### MicroBenchmarks.Serializers.Json_FromString<MyEventsListerViewModel>.SystemTextJson_Reflection_

#### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [00115f085a2df36ea7b135673d290298e20775f7](https://github.com/dotnet/runtime/commit/00115f085a2df36ea7b135673d290298e20775f7)
Compare | [975877333c98d9d08bad66670d74accc6047be34](https://github.com/dotnet/runtime/commit/975877333c98d9d08bad66670d74accc6047be34)
Diff | [Diff](https://github.com/dotnet/runtime/compare/00115f085a2df36ea7b135673d290298e20775f7...975877333c98d9d08bad66670d74accc6047be34)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Text.Json.Serialization.Tests.ReadJson<StructRecord>

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

• [DeserializeFromUtf8Bytes - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 117.91 μs | 88.67 μs | 0.75 | 0.16 | False | | |

![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.Text.Json.Serialization.Tests.ReadJson*'
```

### System.Text.Json.Serialization.Tests.ReadJson<StructRecord>.DeserializeFromUtf8Bytes(Mode: Reflection)

#### 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 src/benchmarks/micro/Serializers/Json_FromString.cs and src/benchmarks/micro/libraries/System.Text.Json/Serializer/ReadJson.cs, then run the listed benchmarks_ci.py filters using the benchmarking workflow documentation. Compare the reported baseline and test results to investigate the two improvements; the issue provides no requested code change or completion criterion.

Written by the indexing model from the issue text.