`DoGetExtensionMethods` allocates large arrays on the LOH

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Description

Contributor guide

Research direction

Analyze the DoGetExtensionMethods method and identify the cause of large array allocations on the LOH. Consider reducing allocation sizes or using alternative data structures.

Tech stack

csharp

Domain

compilers

Issue type

Performance

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Mostly clear

Prerequisites

C#

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

20