https://vercel.com

Largest Contentful Paint is too slow

Your page's main image or headline takes more than 2.5 seconds to show up. Visitors see a blank or half-loaded page, and most will leave before it finishes loading.

First Contentful Paint is slow

Your page takes more than 1.8 seconds before showing any content at all. Visitors stare at a blank screen and may leave before your site even starts to appear.

Performance score is below 70

Your site scores poorly on Google's performance test. Slow sites rank lower in search results and convert significantly fewer visitors into customers.

Page title length is not optimal

Your page title is either too short to be descriptive, or too long and gets cut off in Google search results with "...". Both reduce click-through rates.

H1 heading is missing or duplicated

Every page should have exactly one main heading (H1) that tells Google what the page is about. Missing or multiple H1s confuse search engines and lower your rankings.

OG image missing width and height

Twitter/X, LinkedIn, Telegram, and Discord need the image dimensions declared in your HTML to display the preview correctly. Without them, the preview may be skipped entirely or shown at the wrong size — reducing click-through rate when your link is shared.

Images with empty or missing alt text

Some images have no meaningful alt text. Screen readers read these as "image" with no context, hurting accessibility and image search visibility.

No analytics tracking detected

You can't improve what you don't measure. Without analytics you have no visibility into traffic, user behavior, or conversion goals.

CSP contains 'unsafe-inline' or 'unsafe-eval'

You have a Content Security Policy, but it includes 'unsafe-inline' or 'unsafe-eval' which largely defeats the purpose. It's like having a lock on your door but leaving the key in it.

Missing Permissions-Policy header

Without a Permissions-Policy header, any script on your page can access the camera, microphone, geolocation, and other sensitive browser features. This is a defence-in-depth security header that limits exposure if you get XSS.

Cookie set without HttpOnly flag

Without HttpOnly, JavaScript on the page (including injected scripts from XSS attacks) can read your cookies, including session tokens.

Heading hierarchy is broken

The page outline skips heading levels. That makes machine parsing and assistive reading less reliable.

No content date signal found

Perplexity and Google AI Overview weight fresh content significantly higher. Without a date signal, your page may be treated as potentially outdated — reducing how often AI systems cite it in answers.

No question-format headings found

ChatGPT, Claude, and Perplexity extract headings as Q&A pairs and include them in answers with a link to your page. Pages with question-format headings are cited more often in AI responses.

First paragraph too short for AI citation

AI systems like ChatGPT, Claude, and Perplexity extract the beginning of your page as citation passages. A short or absent opening paragraph means they have little useful content to cite, reducing how often your page appears in AI answers.

No skip navigation link

Keyboard and screen reader users have to tab through every navigation item on every page to reach the main content. A "skip to content" link at the top of the page lets them jump directly to the main area.

Low Lighthouse accessibility score

Your site scores poorly on automated accessibility tests. This means real users — people using screen readers, keyboard navigation, or who need high contrast — likely struggle to use your site.