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performance-auditor

v0.1.0 ExperimentalNo security review by Dakota Smith

Install

Pick the surface you use. Plugins run inside Claude Code, which is available in the terminal CLI, the desktop app on Mac and Windows, the web app at claude.ai/code, and the VS Code and JetBrains extensions. The slash commands are identical on every surface.

From inside any Claude Code session — terminal, desktop app, web app, or IDE extension:

  1. Add the RBA Skills marketplace (only needed once per machine):

    /plugin marketplace add rbaconsulting/rba-skills-plugin

  2. Install performance-auditor:

    /plugin install performance-auditor@rba-ai-hub

  3. Activate it without restarting:

    /reload-plugins

Overview

Performance Auditor

End-to-end web performance tooling for RBA digital experience projects. This plugin covers every phase of the performance improvement cycle: field-data baseline, Lighthouse analysis, root-cause diagnosis, caching review, and a sprint-ready backlog. It targets the metric thresholds Google uses to evaluate Page Experience — LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1 at the 75th-percentile — and produces concrete code-level fixes, not abstract recommendations.

The skills adapt to every platform RBA ships: Sitecore XM Cloud / JSS, Optimizely Content Cloud, Umbraco, and headless/composable front-ends on Azure. They also understand the .NET API and Azure CDN / Azure Front Door caching patterns that sit behind those CMSes.

What's in the bundle

Artifact Purpose
skills/perf-cwv-audit Full Lighthouse + CrUX audit producing a ranked CWV finding report
skills/perf-render-blocking-analysis Deep-dive on render-blocking CSS/JS, font loading, and critical-path optimisation
skills/perf-asset-optimisation Image, video, font, and static-asset review with format/compression/lazy-load fixes
skills/perf-caching-review HTTP cache-header audit across CDN, CMS output cache, API layer, and browser cache
skills/perf-budget-enforcement Define, encode, and enforce performance budgets in CI (Lighthouse CI + GitHub Actions)
skills/perf-backlog-builder Convert any audit report into a prioritised, sprint-ready backlog (Jira / ADO / Markdown)
commands/perf-audit Slash-command entry point — routes to the right skill(s) based on scope argument
agents/perf-reviewer Subagent: runs all six skills in sequence against a URL or project folder, then consolidates

When to use this plugin

  • Before a go-live: Run perf-reviewer against the staging URL to catch regressions before they reach production.
  • During a sprint: Use perf-cwv-audit on individual page templates as they are built.
  • For a client deliverable: Use perf-backlog-builder to turn an audit report into Azure DevOps epics/stories.
  • Setting up a new project: Use perf-budget-enforcement to wire Lighthouse CI into GitHub Actions so regressions are blocked at the PR level.
  • Diagnosing a live regression: Use perf-caching-review + perf-render-blocking-analysis against the production origin to find the culprit.

How to install

claude plugin install performance-auditor@rba-ai-hub

Once installed, all six skills and the slash command are available in any project directory.

Platform coverage

Platform Specific patterns covered
Sitecore XM Cloud / JSS JSS hydration LCP, Sitecore output cache TTLs, XM Cloud CDN rules, SXA Media Library image delivery
Optimizely Content Cloud DXP CDN cache rules, block rendering waterfalls, Optimizely CDN header configuration
Umbraco Umbraco output cache, ImageSharp pipeline, Redis cache, Examine index warm-up
Azure CDN / Front Door Cache rules, origin shield, compression, WAF bypass for API endpoints
Next.js / React (headless) RSC/ISR/SSG render strategy, bundle splitting, <Image> / <Script> discipline
.NET / ASP.NET Core Async/await discipline, EF Core N+1, IMemoryCache / IDistributedCache patterns

CWV thresholds (as of 2026)

Metric Good Needs Improvement Poor
LCP ≤ 2.5 s 2.5 – 4.0 s > 4.0 s
INP ≤ 200 ms 200 – 500 ms > 500 ms
CLS ≤ 0.1 0.1 – 0.25 > 0.25

Google evaluates at the 75th percentile of real-user sessions. All three must be "good" for a page to pass the Page Experience signal.

Bundled artifacts

Skills

  • perf-asset-optimisation — Comprehensive image, video, font, and static-asset review for RBA DX projects. Checks format selection (WebP/AVIF), compression, responsive srcset, lazy loading, CLS-safe sizing, and delivery pipeline configuration for Sitecore Media Library, Umbraco ImageSharp, Optimizely DXP media, and Next.js Image. Produces findings with estimated LCP/CLS impact and code-level fixes for each asset type.
  • perf-backlog-builder — Convert any performance audit report (from perf-cwv-audit, perf-caching-review, perf-render-blocking-analysis, or perf-asset-optimisation) into a prioritised, sprint-ready backlog. Groups findings by impact and component, estimates effort, assigns owner (engineering/design/devops/content), and produces Azure DevOps work items or Jira stories with acceptance criteria tied to specific CWV thresholds. Includes a quick-win list and a governance epic for CI budget enforcement setup.
  • perf-budget-enforcement — Define, encode, and enforce web performance budgets in CI. Generates a Lighthouse CI configuration (lighthouserc.json) with CWV assertion thresholds, a GitHub Actions workflow that runs LHCI on every pull request, and performance budget config for bundle-size checks (bundlesize / size-limit). Produces a PR comment with metric comparisons against the baseline. Targets Azure DevOps pipelines as an alternative output format.
  • perf-caching-review — HTTP cache-header audit across CDN, CMS output cache, .NET API layer, and browser cache. Inspects Cache-Control, ETag, Vary, and CDN-specific headers on origin responses. Maps each resource type to the correct caching strategy and identifies gaps that force unnecessary origin hits. Covers Azure CDN, Azure Front Door, Sitecore output cache, Optimizely DXP CDN, and Umbraco output/Redis caching.
  • perf-cwv-audit — Full Lighthouse + CrUX audit for Core Web Vitals (LCP, INP, CLS). Combines automated Lighthouse scores with field data from Chrome User Experience Report, diagnoses root causes per metric, and produces a severity-ranked finding report with estimated impact deltas. Adapts analysis for Sitecore XM Cloud, Optimizely Content Cloud, Umbraco, and headless/composable stacks on Azure.
  • perf-render-blocking-analysis — Deep-dive analysis of render-blocking CSS, JavaScript, and font resources that delay First Contentful Paint and Largest Contentful Paint. Examines <head> resource order, async/defer discipline, critical CSS coverage, font preloading, and third-party script loading strategies. Produces prioritised fixes with estimated FCP/LCP savings. Platform-aware for Sitecore, Optimizely, Umbraco, and Next.js.

Agents

  • perf-reviewer — Orchestrating subagent that runs all five performance audit skills in sequence against a URL or project directory, consolidates their findings into a single prioritised report, and then invokes perf-backlog-builder to produce sprint-ready work items. Use for full pre-go-live audits or quarterly performance health checks.

Slash Commands

  • /perf-audit — Entry-point slash command for the Performance Auditor plugin. Routes to the appropriate skill(s) based on the scope argument. Without a scope, runs a quick CWV audit. With --full, invokes all skills in sequence via the perf-reviewer agent.
Technical details
Homepage
https://rba-skills.tylerschroeder.net/plugins/performance-auditor/
License
MIT
Maturity
experimental
Security review
No security review
Owners
  • engineering
Platforms
sitecore, optimizely, umbraco, azure
Disciplines
engineering
Lifecycle
test-and-review, build, operate
Tags
  • core-web-vitals
  • lighthouse
  • caching
  • lcp
  • inp
  • cls
  • render-blocking
  • bundle-size
  • image-optimisation
  • cdn
  • azure-cdn
  • azure-front-door
  • performance-budget
  • lighthouse-ci
  • web-vitals
  • sitecore
  • optimizely
  • umbraco
  • dotnet
  • nextjs
  • react
  • performance-backlog
Last updated
by Tyler Schroeder
Source
plugins/performance-auditor/

Edit this plugin's README on GitHub — opens GitHub's web editor. No git knowledge needed.