[Perf] Windows/x86: 19 Regressions on 8/24/2026 8:52:59 AM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK ASP.Net Core Empty Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Net Core Empty Template Build - Process Time ADX - Test Multi Config Graph	513.90 ms	426.45 ms	0.83	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.Net Core Empty Template Build(No Change)*'

Details

SDK ASP.Net Core Empty Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK ASP.NET Core gRPC Service Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
NET Core gRPC Service Template Build - Process Time ADX - Test Multi Config Graph	576.70 ms	409.76 ms	0.71	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.NET Core gRPC Service Template Build(No Change)*'

Details

SDK ASP.NET Core gRPC Service Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
NET Core Web App - Process Time ADX - Test Multi Config Graph	589.60 ms	463.91 ms	0.79	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)*'

Details

SDK ASP.NET Core Web App (Model-View-Controller) Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in Inner Loop MsBuild Console

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Inner Loop MsBuild Console - Generic Startup Diff ADX - Test Multi Config Graph	773.67 ms	797.98 ms	1.03	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Inner Loop MsBuild Console*'

Details

Inner Loop MsBuild Console

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in Inner Loop MVC

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Inner Loop MVC - Generic Startup Diff ADX - Test Multi Config Graph	1281.26 ms	1382.48 ms	1.08	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Inner Loop MVC*'

Details

Inner Loop MVC

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK xUnit Test Project Template Clean Build

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK xUnit Test Project Template Clean Build - Process Time ADX - Test Multi Config Graph	2560.22 ms	2498.42 ms	0.98	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK xUnit Test Project Template Clean Build*'

Details

SDK xUnit Test Project Template Clean Build

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK Console Template net8.0 Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
0 Build - Process Time ADX - Test Multi Config Graph	444.36 ms	331.37 ms	0.75	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK Console Template net8.0 Build(No Change)*'

Details

SDK Console Template net8.0 Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in SDK Console Template net9.0 Clean Build

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
0 Clean Build - Process Time ADX - Test Multi Config Graph	2707.95 ms	2866.46 ms	1.06	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK Console Template net9.0 Clean Build*'

Details

SDK Console Template net9.0 Clean Build

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK New Console

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK New Console - Process Time ADX - Test Multi Config Graph	597.05 ms	478.82 ms	0.80	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK New Console*'

Details

SDK New Console

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in Inner Loop Console

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Inner Loop Console - Generic Startup Diff ADX - Test Multi Config Graph	805.57 ms	834.04 ms	1.04	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Inner Loop Console*'

Details

Inner Loop Console

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK xUnit Test Project Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK xUnit Test Project Template Build - Process Time ADX - Test Multi Config Graph	461.76 ms	336.77 ms	0.73	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK xUnit Test Project Template Build(No Change)*'

Details

SDK xUnit Test Project Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK ASP.NET Core Web App Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
NET Core Web App Template Build - Process Time ADX - Test Multi Config Graph	588.28 ms	492.06 ms	0.84	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.NET Core Web App Template Build(No Change)*'

Details

SDK ASP.NET Core Web App Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in SDK Class library Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK Class library Template Build - Process Time ADX - Test Multi Config Graph	414.90 ms	540.56 ms	1.30	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK Class library Template Build(No Change)*'

Details

SDK Class library Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK Razor Class Library Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK Razor Class Library Template Build - Process Time ADX - Test Multi Config Graph	503.63 ms	386.35 ms	0.77	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK Razor Class Library Template Build(No Change)*'

Details

SDK Razor Class Library Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK MSTest Test Project (.NET Core) Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK MSTest Test Project - Process Time ADX - Test Multi Config Graph	653.59 ms	443.13 ms	0.68	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK MSTest Test Project (.NET Core) Template Build(No Change)*'

Details

SDK MSTest Test Project (.NET Core) Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Regressions in SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
NET Core Web App - Process Time ADX - Test Multi Config Graph	3675.20 ms	3755.41 ms	1.02	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build*'

Details

SDK ASP.NET Core Web App (Model-View-Controller) Template Clean Build

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK ASP.NET Core Web API Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
NET Core Web API Template Build - Process Time ADX - Test Multi Config Graph	589.01 ms	418.96 ms	0.71	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK ASP.NET Core Web API Template Build(No Change)*'

Details

SDK ASP.NET Core Web API Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK F# Console Template Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
SDK F# Console Template Build - Process Time ADX - Test Multi Config Graph	442.06 ms	361.96 ms	0.82	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK F# Console Template Build(No Change)*'

Details

SDK F# Console Template Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

---

Run Information

Name	Value
Architecture	x86
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	64a29867c5c5c8e0babc9e31313cf3b6e50f0193
Compare	c545c4e3f9e2ebc10c6b3e2626187e18569adcf2
Diff	Diff
Configs	CompilationMode:tiered, RunKind:sdk_scenarios

Improvements in SDK Console Template net11.0 Build(No Change)

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
0 Build - Process Time ADX - Test Multi Config Graph	462.95 ms	335.29 ms	0.72	0.00	True

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'SDK Console Template net11.0 Build(No Change)*'

Details

SDK Console Template net11.0 Build(No Change)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[LoopedBard3]

🔍 Automated Triage Analysis

Summary: All 6 reported "regressions" in this Windows/x86 SDK-scenarios batch classify as measurement noise against 297–298 prior runs (every |z| < 2 and every delta below its adaptive threshold), and the same batch simultaneously reports 13 large "improvements" of ~15–30% — a signature of a run-to-run environmental/measurement shift rather than a runtime regression. No commit attribution is made (the dotnet/sdk baseline→compare comparison is not resolvable and all signals are noise). Finding confidence Bisection skipped — autofile run configuration is not supported by the bisection harness.

Finding Confidence: 3/5 (analysis accuracy)
Regression Confidence: 1/5 (likelihood of true regression)
⚠️ Assessment: Likely noise - recommend closing or monitoring for recurrence.

🤖 Proposed Next Actions: Likely noise — close & label — 1 done, 2 dry-run (rule R1_all_noise — see Full Analysis for the table). · 🦆 Re-analysis: ✅ concurs

📊 Full Analysis (click to expand)

Summary: All 6 reported "regressions" in this Windows/x86 SDK-scenarios batch classify as measurement noise against 297–298 prior runs (every |z| < 2 and every delta below its adaptive threshold), and the same batch simultaneously reports 13 large "improvements" of ~15–30% — a signature of a run-to-run environmental/measurement shift rather than a runtime regression. No commit attribution is made (the dotnet/sdk baseline→compare comparison is not resolvable and all signals are noise). Finding confidence 4/5, regression confidence 1/5.

Issue Overview

• Issue: #78327 - [Perf] Windows/x86: 19 Regressions on 8/24/2026 8:52:59 AM +00:00
• Date: 2026-08-24 | Queue: ViperWindows (Windows.11.Amd64.Viper.Perf) | OS/Arch: Windows 10.0.22631 / x86
• Commits: 64a29867 → c545c4e3 (dotnet/sdk, branch 11.0; range not resolvable via API — "Comparison not found")
• Labels: untriaged, perf-regression, arch-x86, os-windows, kind-sdk_scenarios, branch-11.0, compilationmode-tiered, runkind-sdk_scenarios
• Runtime stack: Desktop + CoreCLR (implicit) — but note this is an SDK-scenarios benchmark (end-to-end SDK/MSBuild build wall-clock time in the dotnet/sdk repo), not a runtime microbenchmark.
• Historical Data: Available (297–298 prior runs per test; statistically very large samples). Data quality caveats noted below.

Test Analysis

Test Name	Baseline (ms)	Compare (ms)	Δ%	μ	σ	n	z	Thresh%	Noise?	Assessment
Inner Loop MsBuild Console	773.67	797.98	+3.14%	(corrupt scale)	(corrupt)	298	n/a	n/a	Y	Corrupted historical scale (series ~-8..190 vs ~774 raw); no signal
Inner Loop MVC	1281.26	1382.48	+7.90%	700.4	350.5	298	1.95	100.1%	Y	Within recent plateau (~1140–1779); pre-existing step shift ~run 277
SDK Console Template net9.0 Clean Build	2707.95	2866.46	+5.85%	2778.5	126.1	297	0.70	9.08%	Y	Within historical range (2603–3416); below threshold
Inner Loop Console	805.57	834.04	+3.53%	339.2	249.0	298	1.99	146.8%	Y	Within recent plateau (~650–907); pre-existing step shift ~run 278
SDK Class library Template Build(No Change)	414.90	540.56	+30.29%	810.8	250.1	297	-1.08	61.69%	Y	Bimodal history (old ~920 → new ~400); compare within noisy new regime
SDK ASP.NET Core Web App (MVC) Template Clean Build	3675.20	3755.41	+2.18%	3790.4	137.0	298	-0.26	7.23%	Y	Compare below historical mean; trivial delta

Legend: μ=mean, σ=stddev, n=runs, z=z-score, Thresh%=adaptive threshold. All values in milliseconds.

Finding Confidence: 4/5 - Very large historical samples (297–298 runs) give strong statistical grounding, and the classification is unambiguous (6/6 noise). Downgraded from 5 because "Inner Loop MsBuild Console" historical statistics are corrupted (unit-scale mismatch: stored series ~-8..190 vs raw ~774M), and two tests (Inner Loop MVC / Inner Loop Console) have pre-existing mid-series step shifts that inflate σ. The commit range could not be retrieved for corroboration.

Candidate Stack Relevance

Not applicable. All 6 tests classify as noise, so no regression is attributed and no candidate commit is selected. In addition, the dotnet/sdk baseline→compare comparison is not resolvable via the API ("Comparison not found"), so the commit range could not be enumerated. No ## Candidate Stack Relevance rows are emitted because no Likely Cause is assigned.

Confirmed Regressions

None. All 6 reported regressions are classified as measurement noise:

• Every |z-score| < 2.0 and every |Δ%| is below its per-test adaptive threshold.
• The batch simultaneously reports 13 improvements of roughly 15–30% (e.g., SDK ASP.NET Core gRPC Service Template Build 576.70→409.76 ms, ≈ −29%; SDK MSTest Test Project 653.59→443.13 ms, ≈ −32%). A single run showing many large bidirectional swings is characteristic of an environmental/measurement shift in end-to-end SDK build timing, not a code regression.
• Two "Inner Loop" tests sit on recent historical plateaus created by earlier step shifts (~run 277–278); their compare values fall inside those plateaus.
• The largest nominal delta (SDK Class library Template, +30.29%) still has |z|=1.08 against a bimodal history and is well below its 61.7% adaptive threshold.

Open Questions

• Historical Data: Available and large (297–298 runs), but quality issues exist: (1) "Inner Loop MsBuild Console" historical series is on a corrupted/mismatched unit scale, making its z-score and threshold meaningless; (2) "Inner Loop MVC" and "Inner Loop Console" contain large pre-existing mid-series step shifts (~2–4×) that inflate σ/CV; (3) "SDK Class library Template" history is bimodal (~920 → ~400 ms).
• Confidence Limitations: Commit range not retrievable (dotnet/sdk "Comparison not found"), so no commit-level corroboration was possible. SDK-scenarios wall-clock measurements are inherently noisier than runtime microbenchmarks.
• Verification Needed: None required for triage (all noise). If any test is of concern, a rerun of baseline vs compare would confirm non-reproducibility.
• Bisection Status: Not performed (all tests noise; no culprit to isolate; commit range unavailable).

Recommended Actions

1. Close/deprioritize as noise - All 6 deltas are within historical variance (|z| < 2, below adaptive thresholds) against 297–298 runs; no runtime regression is indicated.
2. Rerun to confirm (optional) - Rerun the batch on baseline and compare to confirm the deltas do not reproduce, given the concurrent 13 large "improvements" pointing to an environmental shift.
3. Data-hygiene follow-up - Investigate the corrupted unit scale for "Inner Loop MsBuild Console" historical series and the mid-series step shifts in the two "Inner Loop" tests; consider resetting the baseline window for "SDK Class library Template" to exclude the old regime so future detection is meaningful.

🤖 Proposed Next Actions

Rule: R1_all_noise — Likely noise — close & label.

All reported regressions were classified as noise.

#	Action	Status	Details
1	Add label	✅ Done	noise
2	Remove label	⏭️ Skipped (dry-run)	untriaged
3	Close issue	⏭️ Skipped (dry-run)	reason not_planned

🦆 Re-analysis (advisory)

✅ Agrees with the analysis — advisory only, not applied

Flags: possible-noise, bimodal-history

Rationale: The analysis is internally consistent: all findings are classified as noise with low change confidence (1/5) and no culprit, which aligns with the bimodal history and skipped bisections. High finding confidence paired with noise=True and low change confidence is expected, not a contradiction, and no culprit was invented.

This critique is advisory in the current configuration and did not change the confidences, culprit, or proposed actions above.

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Generated by PerfTriageAgent on 2026-08-24 09:01 UTC