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Eval Performance

Category: Engineering  ·  Sub-category: performance  ·  Last updated:
type:debug
Guide for diagnosing and improving MSBuild project evaluation performance. Only activate in MSBuild/.NET build context. USE FOR: builds slow before any compilation starts, high evaluation time in binlog analysis, expensive glob patterns walking large directories (node_modules, .git, bin/obj), deep import chains (>20 levels), preprocessed output >10K lines indicating heavy evaluation, property functions with file I/O ($([System.IO.File]::ReadAllText(...))), multiple evaluations per project. Covers the 5 MSBuild evaluation phases, glob optimization via DefaultItemExcludes, import chain analysis with /pp preprocessing. DO NOT USE FOR: compilation-time slowness (use build-perf-diagnostics), incremental build issues (use incremental-build), non-MSBuild build systems. INVOKES: dotnet msbuild -pp:full.xml for preprocessing, /clp:PerformanceSummary.

What this skill does

Eval Performance is a community-contributed Claude Code skill in the performance sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/eval-performance/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Eval Performance Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/eval-performance
curl -L https://claudskills.com/skills/eval-performance/SKILL.md \
  -o ~/.claude/skills/eval-performance/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/eval-performance/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/eval-performance/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\eval-performance\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Eval Performance [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/eval-performance/
BibTeX
@misc{eval-performance-2026,
  author    = {ClaudSkills},
  title     = {Eval Performance [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/eval-performance/}
}

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Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

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