gloscience.com website review

A phone's processor spends 5.5 s on main-thread work while loading, 2.1 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

8 third-party services load with your homepage (Google Tag Manager, TikTok and Facebook and others), adding 2.1 MB and 1.6 s of main-thread time.

Your mobile performance score is 65. Pages that score under 90 lose visitors before the first paint.

About 865 KiB of JavaScript is downloaded but never used on this page.

3 files block the first paint until they finish downloading. Deferring or inlining them could save about 700 ms.

24 files are served with short cache lifetimes, so returning visitors download them again (459 KiB).

Google Tag Manager costs a phone 520 ms of main-thread work and 541 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.

About 32 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 300 ms faster on a phone.

14 long tasks block the main thread while loading, the longest for 262 ms. During a long task the page ignores taps.

Shopify costs a phone 178 ms of main-thread work and 589 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.

Polyfills for old browsers add 82 KiB JavaScript that modern phones do not need.

3 images could be 57 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

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

49 KiB could be saved by minifying JavaScript.

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.

The page becomes fully interactive after 22.8 s. Good is under 3.8 s.

Scripts block taps and scrolling for 928 ms in total while the page loads. Good is under 200 ms.

Your largest element takes 4.1 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' tap response (inp) went from 144 ms to 155 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 18.7 MB in 362 requests on a phone: media 14.8 MB (2), scripts 2.5 MB (180) and other files 749 KiB (131). Under 2 MB keeps phones on slow connections fast.

By the Sustainable Web Design model, a visit to your homepage emits about 5.29 g of CO₂e: 635.1 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

Scrollable region must have keyboard access: 1 element on the page fails this check, rated serious by axe-core.

2 images have no alt text, which hurts accessibility and image search.

All page content should be contained by landmarks: 2 elements on the page fail this check, rated moderate by axe-core.

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

Alternative text of images should not be repeated as text: 1 element on the page fails this check, rated minor by axe-core.

The homepage links to 81 pages on gloscience.com and 8 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.

https://gloscience.com/products/so-brilliant-whitening-kit and https://gloscience.com/products/ultimate-whitening-bundle all use the title “So Brilliant™ - Best At Home LED Teeth Whitening Kit”. Search engines can't tell which page to show for a search, so each competes with the others.

https://gloscience.com/products/so-brilliant-whitening-kit and https://gloscience.com/products/ultimate-whitening-bundle use the same meta description. A description written for each page earns more clicks.

Your homepage links to 1 page by a URL that isn't its canonical one, for example https://gloscience.com/products/ultimate-whitening-bundle, whose canonical is https://gloscience.com/products/so-brilliant-whitening-kit. Linking straight to the canonical URL saves crawlers a detour and keeps ranking signals on one address.

https://gloscience.com/collections/teeth-whitening-devices, https://gloscience.com/pages/get-started, https://gloscience.com/pages/glo-professional-treatments-1, https://gloscience.com/pages/faqs and https://gloscience.com/pages/glo-support-contact have no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 33 found) and read each the way a search engine does.

1 image failed to load on a phone, for example https://bat.bing.com/action/0?ti=97088125&Ver=2&mid=0c1e26cc-a865-40e4-bfb9-f1856530df4f&bo=1&sid=e21ecfb0dd0511f19562654343177364&vid=e21f0de0dd0511f1b0311bb799ceb77a&vids=1&msclkid=N&pi=918639831&lg.

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

3 errors were logged to the browser console while the page loaded, for example “Failed to load resource: net::ERR_FAILED”.

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: 3 trust badges. 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 446 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, Klaviyo and Meta Pixel and 2 mores (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 28 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 47 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.