advent.com website review

59 files are served with short cache lifetimes, so returning visitors download them again (1.5 MB).

4 images could be 686 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 2.4 s faster on a phone.

About 473 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 1.2 s faster on a phone.

16 files block the first paint until they finish downloading. Deferring or inlining them could save about 1.3 s.

Your mobile performance score is 57 (desktop: 52). Pages that score under 90 lose visitors before the first paint.

8 third-party services load with your homepage (Google Tag Manager, Cloudflare CDN and Optanon and others), adding 1.2 MB and 744 ms of main-thread time.

Google Tag Manager costs a phone 397 ms of main-thread work and 537 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.

The page has 1,571 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

About 74 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 150 ms faster on a phone.

Polyfills for old browsers add 29 KiB JavaScript that modern phones do not need. Google estimates it would make the page about 150 ms faster on a phone.

6 long tasks block the main thread while loading, the longest for 132 ms. During a long task the page ignores taps.

Web fonts hide text while they load. Setting font-display: swap shows text immediately (about 50 ms).

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

Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

3 KiB could be saved by minifying JavaScript.

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 4.0 s for the largest content to appear (75th percentile). Good is under 2.5 s.

Real visitors see the first content after 4.0 s (75th percentile). Good is under 1.8 s.

Your largest element takes 13.8 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image “banner-image”.

The page becomes fully interactive after 17.7 s. Good is under 3.8 s.

The first text or image appears after 4.7 s on a phone. Good is under 1.8 s.

Visually, the page fills in at 7.6 s (Speed Index). Good is under 3.4 s.

Over the last 25 four-week periods to 2026-10-24, real Chrome visitors' tap response (inp) went from 111 ms to 149 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Real visitors wait 1.2 s for your server to start answering (75th percentile). Good is under 800 ms.

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

banner-slide-img1.png weighs 681 KiB. On a phone connection a single image that size takes seconds.

2 images are downloaded at several times the size a phone draws them, for example banner-slide-img1.png at 2,904 px wide, shown at 390 px. Resized copies would save about 677 KiB.

Your homepage downloads 2.7 MB in 114 requests on a phone: scripts 1.1 MB (32), images 1.1 MB (23) and fonts 214 KiB (7). Under 2 MB keeps phones on slow connections fast.

2 images (723 KiB) 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.

3 images further down the page (269 KiB) 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 0.75 g of CO₂e: 90.4 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

Main landmark should not be contained in another landmark: 1 element on the page fails this check, rated moderate by axe-core.

Document should not have more than one main landmark: 1 element on the page fails this check, rated moderate by axe-core.

Landmarks should have a unique role or role/label/title (i.e. accessible name) combination: 1 element on the page fails this check, rated moderate by axe-core.

Elements with visible text labels do not have matching accessible names. (1 element).

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

Your meta description is 257 characters; Google truncates after about 160, so the end of your pitch is cut.

4 links use generic text like “click here” or “learn more”, which tells Google nothing about the page behind them.

The homepage links to 117 pages on advent.com and 8 external pages.

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 /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.

We fetched 15 pages linked from your homepage (of 29 found) and read each the way a search engine does.

Chrome logged issues while loading the page (“Content security policy”).

There is no /.well-known/security.txt telling researchers how to report a security problem to you.

advent.com has no CAA record, so any certificate authority may issue a certificate for it. A CAA record naming your provider (for example letsencrypt.org) closes that door.

advent.com's DNS answers are not signed. DNSSEC stops attackers forging them to send visitors or email elsewhere; most registrars switch it on in a click, though most sites still run without it.

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

No testimonials, customer logos, ratings or customer counts on the homepage: nothing tells a new visitor that others already trust you.

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

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 1,265 words of visible text.

Email authentication: SPF record 25 points, plus 15 when it ends in -all (10 for ~all); DMARC record 25, plus 25 for a reject policy (15 for quarantine); a DKIM key on a common selector 10.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, LinkedIn Insight and Microsoft Clarity and 1 more (measured from a US location before any click). A consent tool (OneTrust) is installed; check it blocks these until visitors agree where the law requires it.

Opening the homepage sets 15 cookies, 1 of them by other companies (measured from a US location before any click).

Loading the homepage contacts 38 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.