leucine.io website review

About 318 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 1.6 s faster on a phone.

The page goes through 1 redirect before it starts loading, costing about 1.1 s. Link and advertise the final URL directly.

Your mobile performance score is 52 (desktop: 74). Pages that score under 90 lose visitors before the first paint.

A phone's processor spends 3.5 s on main-thread work while loading, 557 ms of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

Google Fonts costs a phone 0 ms of main-thread work and 359 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

7 long tasks block the main thread while loading, the longest for 127 ms. During a long task the page ignores taps.

6 third-party services load with your homepage (Google CDN, consentpro.com and website-files.com and others), adding 748 KiB and 22 ms of main-thread time.

Real Chrome users on phones do not pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)). Google uses this in ranking.

Real visitors wait 1.9 s for your server to start answering (75th percentile). Good is under 800 ms.

The first text or image appears after 7.7 s on a phone. Good is under 1.8 s.

Your largest element takes 14.0 s to render on a phone. Google's threshold for “good” is 2.5 s.

The page becomes fully interactive after 14.0 s. Good is under 3.8 s.

Visually, the page fills in at 7.7 s (Speed Index). Good is under 3.4 s.

Real visitors wait 2.9 s for the largest content to appear (75th percentile). Good is under 2.5 s.

Real visitors wait 253 ms for the page to respond to a tap (75th percentile). Good is under 200 ms.

For real visitors the layout shifts by 0.12 (75th percentile). Good is under 0.1.

Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' largest content (lcp) went from 2.7 s to 3.3 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Real visitors see the first content after 2.5 s (75th percentile). Good is under 1.8 s.

Scripts block taps and scrolling for 287 ms in total while the page loads. Good is under 200 ms.

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

Your homepage downloads 10.0 MB in 93 requests on a phone: media 7.8 MB (2), scripts 1.1 MB (51) and images 451 KiB (17). Under 2 MB keeps phones on slow connections fast.

1 image (37 KiB) is 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.

By the Sustainable Web Design model, a visit to your homepage emits about 2.83 g of CO₂e: 339.2 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

4 tap targets are too small or too close together to hit reliably with a finger.

Elements must only use permitted ARIA attributes: 3 elements on the page fail this check, rated serious by axe-core.

Scrollable region must have keyboard access: 2 elements on the page fail this check, rated serious by axe-core.

Interactive controls must not be nested: 1 element on the page fails this check, rated serious by axe-core.

All page content should be contained by landmarks: 1 element on the page fails this check, rated moderate by axe-core.

Your title is only 23 characters: “Leucine | AI for Pharma”. Between 30 and 65 characters leaves room to say what you do and for whom.

1 link use generic text like “click here” or “learn more”, which tells Google nothing about the page behind it.

The homepage links to 93 pages on leucine.io and 14 external pages.

https://www.leucine.io/products/electronic-logbook-software and https://www.leucine.io/products/instrument-logbooks all use the title “Electronic Logbook Software for Pharma | Leucine MES”, and 1 other title repeat too. Search engines can't tell which page to show for a search, so each competes with the others.

https://www.leucine.io/products/electronic-logbook-software and https://www.leucine.io/products/instrument-logbooks use the same meta description. A description written for each page earns more clicks.

https://www.leucine.io/products/qms-software and https://www.leucine.io/products/les-software have no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 32 found) and read each the way a search engine does.

23 of 34 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

2 errors were logged to the browser console while the page loaded, for example “Consent Pro: not available for production use. Please purchase a plan at https://my.finsweet.com/plans/create/consent-p…”.

Social proof on the homepage: 24 testimonial or review blocks. Pairing it with named testimonials or customer logos makes it far more convincing.

No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.

There is no form on the homepage, so every lead has to click through to another page first.

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 1,551 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 4 cookies, 1 of them by other companies (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 14 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.