Top runtime issues

C# `in` parameter modifier: Should I be able to create a delegate for a method with non-matching signature?

area-System.Reflection

JIT Performance regression between 1.1 and 2.0 and between 2.0 and 2.1

arch-x86 area-CodeGen-coreclr enhancement optimization tenet-performance

Consider using SIMD registers for "hot" local variables instead of placing them on stack when out of free GP registers

Design Discussion area-CodeGen-coreclr

Calling EventSource.Write with data containing an array of string throws on .net Core 2.1, works on .net Core 2.0

1 area-Tracing-coreclr

Create a profiler API that appends to the TPA list

area-Diagnostics-coreclr enhancement

[JIT] Allow the developer to instruct the JIT to do not reorder goto based blocks.

Design Discussion area-CodeGen-coreclr

LoopCloneContext::EvaluateConditions need to evaluate for const init, limit condition.

JitUntriaged area-CodeGen-coreclr optimization

The "no." opcode prefix is not implemented

JitUntriaged area-CodeGen-coreclr enhancement

Support emitting a constant for the Vector64/128/256.Create hardware intrinsic methods

area-CodeGen-coreclr enhancement

Vector.Narrow performance

JitUntriaged area-CodeGen-coreclr area-System.Numerics tenet-performance