aecom.com website review

44 files block the first paint until they finish downloading. Deferring or inlining them could save about 9.8 s.

About 522 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 2.9 s faster on a phone.

About 166 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 1.2 s faster on a phone.

5 images could be 1.1 MB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 300 ms faster on a phone.

Your mobile performance score is 54 (desktop: 46). Pages that score under 90 lose visitors before the first paint.

58 KiB could be saved by minifying CSS.

Google Tag Manager costs a phone 290 ms of main-thread work and 530 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.

8 third-party services load with your homepage (Google Tag Manager, Mapbox and Unpkg and others), adding 867 KiB and 373 ms of main-thread time.

4 long tasks block the main thread while loading, the longest for 151 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).

18 KiB could be saved by minifying JavaScript.

Polyfills for old browsers add 17 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.

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.

The first text or image appears after 10.4 s on a phone. Good is under 1.8 s.

Your largest element takes 21.9 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “SUSTAINABLE LEGACIES Our 2026 Sustainability Report Discove…”.

The page becomes fully interactive after 22.5 s. Good is under 3.8 s.

Visually, the page fills in at 10.4 s (Speed Index). Good is under 3.4 s.

Real visitors wait 2.8 s for the largest content to appear (75th percentile). Good is under 2.5 s.

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

Over the last 25 four-week periods to 2026-10-10, real Chrome visitors' tap response (inp) went from 143 ms to 141 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-10-10, real Chrome visitors' largest content (lcp) went from 2.0 s to 2.0 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 4.4 MB in 86 requests on a phone: images 2.4 MB (10), scripts 1.1 MB (38) and fonts 710 KiB (7). Under 2 MB keeps phones on slow connections fast.

By the Sustainable Web Design model, a visit to your homepage emits about 1.26 g of CO₂e: 150.7 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

ARIA commands must have an accessible name: 1 element on the page fails this check, rated serious by axe-core.

2 form fields have no label, so screen readers announce an empty box and autofill guesses.

1 visible link has no text or label, so screen readers cannot say where it goes.

No meta description, so Google writes its own snippet from whatever text it finds.

Your title is only 5 characters: “AECOM”. Between 30 and 65 characters leaves room to say what you do and for whom.

Structured data found (ImageObject, Organization, WebPage and WebSite) but with 1 problem, for example “Organization: sameAs is an empty list”.

Open Graph is missing og:description, so shared links fall back to guesses.

The homepage links to 178 pages on aecom.com and 24 external pages.

Your Organization JSON-LD is missing sameAs (social profiles), description and contact details. These are the facts AI assistants use to describe a business and to tell it apart from others with a similar name.

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.

/careers/welcoming-workplace and /about-us/sustainability have no meta description, so Google writes the search snippet from whatever text it finds.

Your homepage links to 1 page by a URL that isn't its canonical one, for example /about-us/sustainability, whose canonical is /aecom-tishman/sustainability. Linking straight to the canonical URL saves crawlers a detour and keeps ranking signals on one address.

We fetched 15 pages linked from your homepage (of 104 found) and read each the way a search engine does.

No Content-Security-Policy header, the main browser-side defence against injected scripts.

HSTS is set, but max-age is 0 days; one year is the recommended minimum.

No Referrer-Policy header, so full URLs can leak to the sites you link to.

No Permissions-Policy header to switch off camera, microphone and location for embedded content.

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

aecom.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.

aecom.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.

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 503 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 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.

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