How Scores Are Calculated

Krokanti Audit uses two data sources to generate your scores:

Google PageSpeed Insights API — Provides real Lighthouse scores for Performance, SEO, Accessibility, and Best Practices when available.
Our rule engine — 30+ custom rules that check things PageSpeed doesn't cover: security headers, meta descriptions, structured data, robots.txt, alt text coverage, and more.

When PSI data is available, we use its scores as the primary input. The rule engine supplements with additional checks and provides recommendations regardless.

Score Categories

Performance (40% of Overall)

Based on Core Web Vitals and other speed metrics:

LCP (Largest Contentful Paint) — loading speed
CLS (Cumulative Layout Shift) — visual stability
INP (Interaction to Next Paint) — interactivity
TTFB (Time to First Byte) — server response speed
FCP (First Contentful Paint) — when first content appears
TBT (Total Blocking Time) — main thread blocking

SEO (30% of Overall)

How well search engines can crawl, understand, and rank your page:

Meta title and description quality
Heading structure (H1, H2, H3)
Canonical tags
Robots.txt and noindex directives
Sitemap presence
Structured data (JSON-LD)
Mobile friendliness
URL structure

Accessibility (20% of Overall)

WCAG 2.1 compliance and usability for people with disabilities:

Image alt text
Color contrast ratios
Form labels
ARIA attributes
Keyboard navigation signals
Link descriptions

Best Practices (10% of Overall)

Technical hygiene and security:

HTTPS implementation
Security headers (CSP, HSTS, X-Frame-Options)
Mixed content
Image sizing and formats
Font loading

Why My Score Changed

Scores can change between audits for several reasons:

Server load — PageSpeed tests real server conditions. If your server was busy, TTFB may be higher.
Network conditions — PSI uses a simulated 4G connection. This is consistent but your real-world timing may vary.
Content changes — New images, scripts, or CSS you've added
Third-party services — Slow responses from analytics, chat widgets, or ad networks

Score vs. Real-World Experience

A 90+ score doesn't guarantee a perfect experience for all users, and a 70 score doesn't mean your site is broken. The score reflects what a simulated test finds under standard conditions.

Field data (from real users via Google CrUX) is the most accurate picture. Use Google Search Console's Core Web Vitals report alongside Krokanti Audit for the full picture.