02lungtrainer.com website review

About 1.7 MB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 1.4 s faster on a phone.

pickaxe.co costs a phone 1.3 s of main-thread work and 16 KiB of downloads while your page loads. That alone is enough to make taps feel slow. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

Your mobile performance score is 30 (desktop: 59). Under 50 is Google's “poor” band: many phone visitors leave before the page is usable.

A phone's processor spends 8.0 s on main-thread work while loading, 3.6 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

8 third-party services load with your homepage (pickaxe.co, Stripe and Klaviyo and others), adding 1.1 MB and 1.9 s of main-thread time.

20 long tasks block the main thread while loading, the longest for 1.4 s. During a long task the page ignores taps.

11 files are served with short cache lifetimes, so returning visitors download them again (605 KiB).

15 images could be 817 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 150 ms faster on a phone.

Stripe costs a phone 292 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.

4 files block the first paint until they finish downloading. Deferring or inlining them could save about 300 ms.

The page has 2,040 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

Shopify costs a phone 106 ms of main-thread work and 672 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.

28 KiB JavaScript is shipped twice across bundles. Google estimates it would make the page about 100 ms faster on a phone.

Polyfills for old browsers add 25 KiB JavaScript that modern phones do not need.

About 24 KiB of CSS is downloaded but never applied on this page.

Desktop scores 59 but mobile only 30. 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 22.5 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image “O2Trainer - Train Your Breath”.

The page becomes fully interactive after 22.7 s. Good is under 3.8 s.

Visually, the page fills in at 11.8 s (Speed Index). Good is under 3.4 s.

Scripts block taps and scrolling for 2.0 s in total while the page loads. Good is under 200 ms.

The first text or image appears after 3.9 s on a phone. Good is under 1.8 s.

Chrome's UX Report (opens in a new tab) has too little real-visitor traffic for this site, so the figures here are lab measurements from Google's test phone on a throttled 4G connection.

Your homepage downloads 23.7 MB in 410 requests on a phone: media 17.7 MB (4), scripts 3.2 MB (114) and other files 1.3 MB (232). Under 2 MB keeps phones on slow connections fast.

409a0c84c64cc7e419254a2a96085de3_1788944934.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).

2 images (528 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.

By the Sustainable Web Design model, a visit to your homepage emits about 6.72 g of CO₂e: 806.7 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.

Links must have discernible text: 3 elements on the page fail this check, rated serious by axe-core.

Scrollable region must have keyboard access: 2 elements on the page fail this check, rated serious by axe-core.

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

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

All page content should be contained by landmarks: 75 elements on the page fail this check, rated moderate by axe-core.

Elements with visible text labels do not have matching accessible names. (3 elements).

Your title is 74 characters, so Google will cut it off around 60: “The O2Trainer, A Powerful Breathing Exerciser – Bas Rutten - O2Trainer.com”.

Your canonical URL points to o2trainer.com, not 02lungtrainer.com, so Google may credit that host instead.

There are 3 <h1> headlines (“”, “Stronger Breathing in just 30 Breaths a Day.” and “Stronger Breathing in just 30 Breaths a Day.”). One clear main headline is easier for people and search engines.

Your meta description is 288 characters; Google truncates after about 160, so the end of your pitch is cut.

Structured data found (BreadcrumbList and Organization) but with 2 problems, for example “Organization: url points at a different host (https://o2trainer.com)”.

The homepage links to 63 pages on 02lungtrainer.com and 19 external pages.

/products/o2-trainer-inspiratory-muscle-breathing-exerciser and /collections/all-products/products/o2-trainer-inspiratory-muscle-breathing-exerciser all use the title “The O2Trainer 2.0 – Improve Stamina & Breathing Strength – Bas Rutten…”. Search engines can't tell which page to show for a search, so each competes with the others.

/products/o2-trainer-inspiratory-muscle-breathing-exerciser and /collections/all-products/products/o2-trainer-inspiratory-muscle-breathing-exerciser use the same meta description. A description written for each page earns more clicks.

/pages/faqs, /pages/contact and /pages/reviews have no <h1> headline, so visitors and search engines get no clear main topic.

We fetched 15 pages linked from your homepage (of 28 found) and read each the way a search engine does.

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

1 image is displayed at the wrong aspect ratio, so it looks stretched or squashed.

HSTS is set, but max-age is 91 days; one year is the recommended minimum.

1 link go through two or more redirects, for example https://o2trainer.com/customer_authentication/redirect?locale=en&region_country=US.

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.

X-XSS-Protection is set to “1; mode=block”; the header is deprecated and can introduce bugs. Use 0 or remove it.

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

02lungtrainer.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.

02lungtrainer.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.

Social proof on the homepage: 213 testimonial or review blocks. Pairing it with named testimonials or customer logos makes it far more convincing.

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

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 529 words of visible text.

02lungtrainer.com has no DMARC record, so nothing tells receivers what to do with mail that fails SPF or DKIM. Gmail and Yahoo require DMARC from bulk senders.

02lungtrainer.com has no SPF record, so mail servers can't tell which servers may send email as you. Your mail lands in spam more often, and anyone can send mail pretending to be you.

We found no DKIM key on the selectors the big email providers use. If you send through one of them, turning on DKIM signing improves delivery.

02lungtrainer.com has no MX record, so it receives no email. SPF -all and DMARC reject still matter: they stop others sending mail as you.

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 Amazon Ads, Google Ads, Google Analytics, Google Tag Manager and Klaviyo and 3 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 20 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 37 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.