Audit report for

protonvpn.com

Last audited on Jul 10, 2026

Performance and AI readiness need significant improvements

The site has strong SEO and best practices scores but suffers from poor performance and low AI readiness. Key issues include slow LCP, high TBT, and lack of structured data and caching strategies.

0/100

Overall

05090100

Score profile

Category insights

Performance86

LCP is 3002ms which is above the ideal threshold. TBT is 327ms indicating excessive main-thread work.

SEO100

SEO score is 100 but missing structured data and canonical tags could limit search visibility.

Accessibility81

Several accessibility issues related to ARIA roles and touch target size were identified.

Best practices100

Best practices score is 100 but lacks some key elements like CSP headers.

AI readiness55

No structured data, no llms.txt, and no content security policy hinder AI agent interaction.

Performance metrics

3.0s

Largest Contentful Paint

Lab

0.00

Cumulative Layout Shift

Lab

327ms

Total Blocking Time

Lab

1.8s

First Contentful Paint

Lab

2.8s

Largest Contentful Paint

Real user

131ms

Interaction to Next Paint

Real user

0.00

Cumulative Layout Shift

Real user

1.0 MB

Page weight

Lab

0.59 g

CO2 per visit

Lab

Marketing readiness

Web analytics

Missing

Advertising pixel

Missing

Live chat

Missing

Blog or content

Present

Pricing page

Present

Email capture

Missing

AI crawler access

ChatGPT

Allowed

Claude

Allowed

Perplexity

Allowed

Gemini

Allowed

Common Crawl

Allowed

llms.txt

Missing

Structured data

Missing

Tech and tools detected

None detected

Social presence

Instagram

TikTok

YouTube

Facebook

Compare with competitors

Recommendations

20 issues found

High

Reduce unused CSS

Est savings of 41 KiB

Low effort

How to fix

Use a CSS optimizer to remove unused styles. Implement critical CSS for above-the-fold content and defer non-critical CSS.

Impact

Reduce initial load size by 41 KiB

CSS optimizerCritical CSS generator

High

Improve image delivery

Est savings of 115 KiB

Medium effort

How to fix

Convert images to next-gen formats like WebP or AVIF. Implement responsive images using srcset and sizes attributes.

Impact

Reduce image payload by 115 KiB

Image optimizerWebP converterResponsive image generator

High

Use efficient cache lifetimes

Est savings of 419 KiB

Medium effort

How to fix

Configure HTTP caching headers for static assets. Set long cache durations for resources that do not change frequently.

Impact

Reduce repeated downloads by 419 KiB

HTTP cache configurationCDN settings

High

Reduce JavaScript execution time

1.4 s

High effort

How to fix

Minify and compress JavaScript files. Use code splitting to load only necessary scripts on initial page load.

Impact

Reduce JavaScript execution time by 1.4 s

JavaScript minifierCode splitting toolTree shaker

High

Minimize main-thread work

2.8 s

High effort

How to fix

Defer non-critical JavaScript and use lazy loading for off-screen content. Optimize render-blocking resources.

Impact

Reduce main-thread work by 2.8 s

Defer script loaderLazy loading implementationRender-blocking resource analysis

High

Reduce unused JavaScript

Est savings of 26 KiB

Medium effort

How to fix

Analyze and remove unused JavaScript functions. Use tree shaking to eliminate dead code in bundled files.

Impact

Reduce JavaScript payload by 26 KiB

Tree shakerJavaScript analyzerDead code removal tool

High

Add structured data

No structured data (JSON-LD) for AI and search engines

Medium effort

How to fix

Implement JSON-LD structured data for key page elements such as organization, product, or article information.

Impact

Improve AI agent understanding and search engine visibility

Schema.org markup generatorJSON-LD validator

High

Add llms.txt file

No llms.txt for AI agents

Low effort

How to fix

Create an llms.txt file at the root of the domain to specify which pages should be excluded from AI indexing.

Impact

Ensure compliance with AI agent policies and improve crawl efficiency

Text editorFile deployment

High

Add Content-Security-Policy header

No Content-Security-Policy header

Medium effort

How to fix

Configure a Content-Security-Policy HTTP header to restrict the sources of scripts and other resources.

Impact

Enhance security and improve AI agent compatibility

Header configurationCSP generator

Medium

Add canonical link

No canonical link

Low effort

How to fix

Implement a canonical link tag to indicate the preferred version of duplicate content pages.

Impact

Avoid duplicate content issues and improve search engine indexing

HTML editorCanonical tag generator

Medium

Fix ARIA role requirements

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

Medium effort

How to fix

Ensure all ARIA roles have properly nested child elements as required. Validate ARIA structure using accessibility tools.

Impact

Improve screen reader compatibility and user experience for assistive technologies

ARIA validation toolAccessibility testing framework

Medium

Fix ARIA parent-child relationships

`[role]`s are not contained by their required parent element

Medium effort

How to fix

Ensure all ARIA roles are properly nested within their required parent elements. Use semantic HTML where possible.

Impact

Improve screen reader navigation and accessibility compliance

Accessibility testing frameworkHTML validator

Medium

Add Content-Security-Policy header

No Content-Security-Policy header

Medium effort

How to fix

Configure a Content-Security-Policy HTTP header to restrict the sources of scripts and other resources.

Impact

Enhance security and improve AI agent compatibility

Header configurationCSP generator

High

Optimize initial server response time

Root document took 330 ms

High effort

How to fix

Optimize server-side rendering and reduce backend processing time. Use a CDN to serve static assets closer to users.

Impact

Reduce initial server response time by 328 ms

CDN integrationServer-side optimizationLoad testing

See the full recommendations

Enter your email to unlock the prioritized recommendations and growth plan for this site.

Want us to fix this and grow your product?

Talk to Soedja