julienlucas.com website review

17 images could be 2.1 MB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

1 file blocks the first paint until they finish downloading. Deferring or inlining it could save about 400 ms.

2 third-party services load with your homepage (Google Tag Manager and Google Analytics), adding 178 KiB and 121 ms of main-thread time.

About 99 KiB of JavaScript is downloaded but never used on this page.

3 long tasks block the main thread while loading, the longest for 75 ms. During a long task the page ignores taps.

Polyfills for old browsers add 14 KiB JavaScript that modern phones do not need.

Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

Visually, the page fills in at 4.7 s (Speed Index). Good is under 3.4 s.

The page becomes fully interactive after 5.3 s. Good is under 3.8 s.

3 images have no width and height attributes, so the layout jumps as each one loads.

Chrome's UX Report (opens in a new tab) has too little real-visitor traffic for this site, so the figures here are lab measurements from Google's test phone on a throttled 4G connection.

Your homepage downloads 6.8 MB in 47 requests on a phone: images 6.3 MB (24), scripts 326 KiB (11) and fonts 98 KiB (5). Under 2 MB keeps phones on slow connections fast.

3 images weigh 5.2 MB together. On a phone connection a single image that size takes seconds.

5 images are downloaded at several times the size a phone draws them, for example IMG_7160.jpg at 3,024 px wide, shown at 423 px. Resized copies would save about 4.4 MB.

10 images (6.1 MB) are JPEG, PNG or GIF. The same pictures as WebP or AVIF are usually much smaller at the same quality, and every current browser shows them.

9 images further down the page (5.5 MB) download before anyone scrolls to them. Adding loading="lazy" lets the first screen load first.

By the Sustainable Web Design model, a visit to your homepage emits about 1.92 g of CO₂e: 230.2 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

31 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

1 form field has no label, so screen readers announce an empty box and autofill guesses.

Headings skip levels (h2 → h5), which makes the page harder to scan with a screen reader.

Your title is 77 characters, so Google will cut it off around 60: “Julien Lucas — Applied AI Engineer, des agents et RAG en prod de bout en bout”.

No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

No canonical URL, so duplicate versions of the homepage (with or without www, with tracking parameters) can split ranking signals.

No Open Graph image (also missing: og:title, og:description), so links shared on LinkedIn, Slack or Facebook show no preview picture.

No XML sitemap at https://julienlucas.com/sitemap.xml, so Google discovers your pages only by following links.

There is no robots.txt at julienlucas.com/robots.txt, the first file search crawlers ask for.

The homepage links to only 1 page on your own site, so visitors and crawlers find few routes into the rest of it.

No twitter:card tag. X falls back to Open Graph, which is incomplete here.

There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.

There is no https://julienlucas.com/llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.

1 error was logged to the browser console while the page loaded, for example “Minified React error #418; visit https://react.dev/errors/418?args[]=HTML&args[]= for the full message or use the non-m…”.

On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.

Social proof on the homepage: 5 customer or partner logos. Pairing it with named testimonials or customer logos makes it far more convincing.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

The homepage carries about 963 words of visible text.

Before a visitor clicks anything, the page loads Google Analytics and Google Tag Manager (measured from a US location before any click). No consent tool was detected. Visitors from the EU, UK and several US states must be asked first.

Opening the homepage sets 2 cookies (measured from a US location before any click).

No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.

Loading the homepage contacts 2 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.