campbellsci.com website review

1 image could be 1,006 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 4.8 s faster on a phone.

About 683 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 2.3 s faster on a phone.

3 files block the first paint until they finish downloading. Deferring or inlining them could save about 2.4 s.

Your mobile performance score is 55. Pages that score under 90 lose visitors before the first paint.

Google Tag Manager costs a phone 244 ms of main-thread work and 349 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.

6 third-party services load with your homepage (Google Tag Manager, Clarity and Google Analytics and others), adding 423 KiB and 330 ms of main-thread time.

5 files are served with short cache lifetimes, so returning visitors download them again (131 KiB).

About 35 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.

5 long tasks block the main thread while loading, the longest for 144 ms. During a long task the page ignores taps.

The HTML itself could arrive sooner: redirects, a slow server response or missing compression delay everything after it.

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.

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

Real visitors see the first content after 3.3 s (75th percentile). Good is under 1.8 s.

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

Your largest element takes 18.4 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “When Measurements Matter We are committed to satisfying the…”.

The page becomes fully interactive after 21.8 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 204 ms for the page to respond to a tap (75th percentile). Good is under 200 ms.

Over the last 25 four-week periods to 2026-10-31, real Chrome visitors' tap response (inp) went from 99 ms to 142 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-10-31, real Chrome visitors' largest content (lcp) went from 3.0 s to 4.4 s 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.

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

Your homepage downloads 4.2 MB in 143 requests on a phone: scripts 1.9 MB (95), images 1.7 MB (6) and stylesheets 367 KiB (3). Under 2 MB keeps phones on slow connections fast.

1 image (71 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 1.19 g of CO₂e: 142.5 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

ARIA dialog and alertdialog nodes should have an accessible name: 1 element on the page fails this check, rated serious by axe-core.

1 image has no alt text, which hurts accessibility and image search.

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

Your title is only 24 characters: “When Measurements Matter”. Between 30 and 65 characters leaves room to say what you do and for whom.

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

Your meta description is 183 characters; Google truncates after about 160, so the end of your pitch is cut.

Structured data found (WebSite) but with 1 problem, for example “WebSite: missing name”.

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

No favicon is declared in the HTML, so browser tabs and Google's mobile results may show a generic icon.

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

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

The homepage links to 41 pages on campbellsci.com and 1 external page.

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.

The HTML your server sends has 547 of the 1,255 words a browser shows. AI crawlers don't run JavaScript, so they miss the rest.

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.

/environmental, /infrastructure, /renewable-energy, /about, /environmental/aviation-weather and /environmental/extreme-applications and 8 others have no <title>, so Google invents the link text in results.

/environmental, /infrastructure, /renewable-energy, /about, /environmental/aviation-weather and /environmental/extreme-applications and 8 others have no meta description, so Google writes the search snippet from whatever text it finds.

We fetched 15 pages linked from your homepage (of 25 found) and read each the way a search engine does.

Large scripts ship without source maps.

1 link from your homepage to your own site is broken, for example https://www.campbellsci.com/auth/microsoft?return_to=%2F (404).

No Strict-Transport-Security header, so browsers may still try plain http first on a return visit.

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

Neither X-Frame-Options nor a CSP frame-ancestors policy is set, so any site can embed yours in a frame.

X-Content-Type-Options: nosniff is missing, so browsers may guess file types.

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.

campbellsci.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.

Your homepage shows a street address but no LocalBusiness JSON-LD, so Google and AI assistants have to guess your address, hours and phone from the page text.

No analytics or tag manager detected in the HTML, so you can't measure whether any of these fixes work.

The homepage shows no opening hours. If customers visit or call, show when.

Your phone number appears as text but isn't a tel: link, so phone visitors can't tap to call.

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

There is no link to Google or Apple Maps. A directions link is one tap for a phone visitor.

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 1,255 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 and Microsoft Clarity (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 9 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 13 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.