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ClaudSkills / Engineering / performance

Build Perf Diagnostics

Category: Engineering  ·  Sub-category: performance  ·  Last updated:
type:debug
Diagnose MSBuild build performance bottlenecks using binary log analysis. Only activate in MSBuild/.NET build context. USE FOR: identifying why builds are slow by analyzing binlog performance summaries, detecting ResolveAssemblyReference (RAR) taking >5s, Roslyn analyzers consuming >30% of Csc time, single targets dominating >50% of build time, node utilization below 80%, excessive Copy tasks, NuGet restore running every build. Covers timeline analysis, Target/Task Performance Summary interpretation, and 7 common bottleneck categories. Use after build-perf-baseline has established measurements. DO NOT USE FOR: establishing initial baselines (use build-perf-baseline first), fixing incremental build issues (use incremental-build), parallelism tuning (use build-parallelism), non-MSBuild build systems. INVOKES: dotnet msbuild binlog replay with performancesummary, grep for analysis.

What this skill does

Build Perf Diagnostics 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/build-perf-diagnostics/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Build Perf Diagnostics 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/build-perf-diagnostics
curl -L https://claudskills.com/skills/build-perf-diagnostics/SKILL.md \
  -o ~/.claude/skills/build-perf-diagnostics/SKILL.md

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

Skills live at ~/.claude/skills/build-perf-diagnostics/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\build-perf-diagnostics\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

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

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). Build Perf Diagnostics [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/build-perf-diagnostics/
BibTeX
@misc{build-perf-diagnostics-2026,
  author    = {ClaudSkills},
  title     = {Build Perf Diagnostics [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/build-perf-diagnostics/}
}

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