Diagnose and fix web performance issues including Core Web Vitals (LCP, INP, CLS), bundle size, asset optimization, render performance, and runtime efficiency.
SkillScore91Maintained
Automatic
◆Frontend / UI pack
Last verified 8/20/2026
What it changes
Passed 20 of 22 test cases with the skill, and 18 of 22 without it.
Without skill82%
With skill91%
Checks it passed that the model alone missed
refers the user to general QA testing workflows
declines to perform functional post-deploy QA testing
recommends caching content on a Content Delivery Network
2 fixed18 passed either way2 still failing0 broke
Pass-rate lift
+9 pp
Tokens
+94%
Agent turns
0%
Response time
+13%
Model gemini-3.6-flashMeasured 8/20/2026v220 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 2
Prompt
Database query latency on our server-side rendered dashboard causes a 1.5-second initial document fetch time for users geographically far from our single origin server. What infrastructure pattern should be implemented at the edge to reduce server response latency?
What was checked, without and with the skill
Checked
Without skill
With skill
recommends caching content on a Content Delivery Network
Missed
Passed
case-10 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md272 lines4 files
Performance Optimization
Diagnose web performance issues and produce a remediation plan. Stack-agnostic. Anchored to Core Web Vitals and standard browser performance patterns.
This skill goes deeper than the performance checks in qa-testing and seo-technical. Use this when performance itself is the goal.
Designing build-your-own product configurators (Tesla-style, custom-pricing, plan-builders) with constraint logic, real-time pricing, validation, and save-and-share mechanics. Honest about infinite-options (decision paralysis), canned-bundles-only (no real customization), and guided-configuration (smart defaults plus meaningful constraints plus escape hatches) patterns. Triggers on configurator design, build-your-own, custom configuration, plan builder, product customizer, configuration tool. Al