labcorp.com website review

102 files are served with short cache lifetimes, so returning visitors download them again (2.8 MB).

10 images could be 3.6 MB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 9.2 s faster on a phone.

15 files block the first paint until they finish downloading. Deferring or inlining them could save about 3.9 s.

About 343 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 1.5 s faster on a phone.

Your mobile performance score is 54 (desktop: 79). Pages that score under 90 lose visitors before the first paint.

About 114 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 600 ms faster on a phone.

Optanon costs a phone 229 ms of main-thread work and 314 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 2,068 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

6 third-party services load with your homepage (Optanon, Cloudflare and hlx.page and others), adding 631 KiB and 239 ms of main-thread time.

Polyfills for old browsers add 19 KiB JavaScript that modern phones do not need. Google estimates it would make the page about 150 ms faster on a phone.

3 long tasks block the main thread while loading, the longest for 130 ms. During a long task the page ignores taps.

Desktop scores 79 but mobile only 54. A gap that wide usually means heavy scripts and images that hit phones hardest.

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.

Your largest element takes 25.9 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the element shown below.

The page becomes fully interactive after 26.3 s. Good is under 3.8 s.

The first text or image appears after 7.3 s on a phone. Good is under 1.8 s.

Visually, the page fills in at 13.2 s (Speed Index). Good is under 3.4 s.

Over the last 25 four-week periods to 2026-10-03, real Chrome visitors' tap response (inp) went from 84 ms to 86 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-10-03, real Chrome visitors' largest content (lcp) went from 1.5 s to 1.5 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 5.7 MB in 121 requests on a phone: images 4.2 MB (61), scripts 989 KiB (29) and stylesheets 221 KiB (16). Under 2 MB keeps phones on slow connections fast.

4 images weigh 3.3 MB together. On a phone connection a single image that size takes seconds.

9 images are downloaded at several times the size a phone draws them, for example ondemand-card.png at 1,200 px wide, shown at 350 px. Resized copies would save about 1.4 MB.

9 images further down the page (3.1 MB) download before anyone scrolls to them. Adding loading="lazy" lets the first screen load first.

5 images (1.2 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.

labcorp-logo.png is on the first screen but marked loading="lazy", so the browser waits before fetching it and the page looks finished later. Load it eagerly (and give it fetchpriority="high" if it is the main image).

By the Sustainable Web Design model, a visit to your homepage emits about 1.61 g of CO₂e: 192.7 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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).

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

1 link has no real href, so search engines can't follow it.

The homepage links to 240 pages on labcorp.com and 49 external pages.

Your Organization JSON-LD is missing logo, sameAs (social profiles) 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.

We fetched 15 pages linked from your homepage (of 130 found) and read each the way a search engine does.

4 of 20 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

6 errors were logged to the browser console while the page loaded, for example “Failed to load resource: the server responded with a status of 404 ()”.

Large scripts ship without source maps.

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: 9 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.

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 611 words of visible text.

Opening the homepage sets 6 cookies (measured from a US location before any click).

Loading the homepage contacts 8 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.