[mono] .NET 10 Performance Overview

[matouskozak]

Description

This issue provides an overview of the all performance regressions from microbenchmark automated runs in WASM, Mono AOT, and Interpreter during the timeframe of .NET 10 preview releases. WASM regressions are tracked separately at #96444.

List of queries for autofilling issues:

• Mono AOT autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aissue+is%3Aopen+label%3Amono-aot
• Interpreter autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+is%3Aissue+label%3Amono-interpreter
• Mono JIT autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+is%3Aissue+label%3Amono-jit
• WASM autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+is%3Aissue+label%3Aarch-wasm
• WASM AOT autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+is%3Aissue+label%3Awasm-aot
• Mono iOS autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?page=1&q=is%3Aopen+label%3Akind-ios_scenarios+-label%3Aruntime-nativeaot+label%3Aruntime-mono
• Mono Android autofilling issues: TBA
• NativeAOT iOS autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+label%3Akind-ios_scenarios+label%3Aruntime-nativeaot
• Maui iOS autofilling issues: https://github.com/dotnet/perf-autofiling-issues/issues?q=is%3Aopen+label%3Amaui+label%3Akind-maui_scenarios_ios
• Maui Android autofilling issues: TBA

Widespread Regressions

Date	Issue	Status	Description
2025/01/28	#112236	Investigating	FrozenDictionary regression, x64/arm64 AOT-llvm and JIT
2025/02/01	dotnet/perf-autofiling-issues#49586	In progress	Random.Next regression, x64/arm64 AOT-llvm and JIT
2025/01/10	#111911	Investigating	Number serialization regressions, x64/arm64 JIT/AOT
2024/11/06	#109914	Investigating	Span-related, affecting JIT/AOT
2024/10/29	#109925	Investigating	System.Numerics.Vector-related, affecting JIT/MonoAOT/WasmAOT

Mono AOT

Details

Date	Issue	Status	Description
2024/09/16	dotnet/perf-autofiling-issues#41780	Investigating	Possibly caused by fix to MonoAOT JIT interactions
2024/09/09-10	#107910	Investigating	Likely caused by SearchValues
2024/08/19-23	#107308	Reverted	Caused by not defining HAS_CUSTOM_BLOCKS

Mono Interpreter

Details

Issue	Status	Description
dotnet/perf-autofiling-issues#48097	Investigating
#112237	Resolving	gsharedvt's bloat
dotnet/perf-autofiling-issues#40314	Resolving	Missing fast path
dotnet/perf-autofiling-issues#42274	Resolved	Missing Mono support

Mono JIT

Details

Issue	Status	Description
#111916	Investigating	DateTime regressions
dotnet/perf-autofiling-issues#42752	Resolved	-
#109914	Investigating	-

Mono Android

Details

Issue	Status	Description

Mono iOS

Details

Date	Issue	Status	Description
2024/01/16	#111673	Untriaged	Mono iOS sample app, 14.12 -> 14.27 MB (1%)
2024/09/30	dotnet/perf-autofiling-issues#42390	Closed	NativeAOT, 3.04 -> 3.10 MB (60 kB / 2%)

MAUI

Details

Issue	Status	Description