seriosystems.com website review

Your mobile performance score is 67. Pages that score under 90 lose visitors before the first paint.

3 images could be 147 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 450 ms faster on a phone.

5 third-party services load with your homepage (leadconnectorhq.com, Cloudflare and Google Fonts and others), adding 1.2 MB and 161 ms of main-thread time.

leadconnectorhq.com costs a phone 143 ms of main-thread work and 990 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 186 KiB of JavaScript is downloaded but never used on this page.

10 files are served with short cache lifetimes, so returning visitors download them again (100 KiB).

1 long task block the main thread while loading, the longest for 84 ms. During a long task the page ignores taps.

About 19 KiB of CSS is downloaded but never applied on this page.

Polyfills for old browsers add 10 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.

2 KiB could be saved by minifying CSS.

2 KiB could be saved by minifying JavaScript.

The layout shifts by 0.446 while loading, so content jumps under the reader's thumb. Good is under 0.1.

Your largest element takes 4.0 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

The page becomes fully interactive after 6.7 s. Good is under 3.8 s.

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

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.

61745ef898218dbf853c52b6.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 are downloaded at several times the size a phone draws them, for example 61745ef898218dbf853c52b6.png at 4,000 px wide, shown at 204 px. Resized copies would save about 126 KiB.

1 image (85 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 0.38 g of CO₂e: 45.0 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

All page content should be contained by landmarks: 33 elements on the page fail this check, rated moderate by axe-core.

Your title is only 13 characters: “Serio Systems”. Between 30 and 65 characters leaves room to say what you do and for whom.

No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

Your meta description is only 48 characters: “Reviews, Messaging & Payments For Local Business”. 70 to 160 characters is enough to sell the click.

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

No XML sitemap at https://seriosystems.com/sitemap.xml, so Google discovers your pages only by following links.

The homepage links to 18 pages on seriosystems.com and 4 external pages.

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.

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.

/ and /Homepage all use the title “Serio Systems”. Search engines can't tell which page to show for a search, so each competes with the others.

/payments, /about-us and /pricing-7692 have no <h1> headline, so visitors and search engines get no clear main topic.

/contact, /demo and /schedule have under 150 words in the HTML. Thin pages rarely rank; if the text loads with JavaScript, crawlers that don't run it see even less.

We fetched 12 pages linked from your homepage and read each the way a search engine does.

2 of 7 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

1 link from your homepage to your own site is broken, for example https://seriosystems.com/cdn-cgi/l/email-protection (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.

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

seriosystems.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.

seriosystems.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 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 373 words of visible text.

seriosystems.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.

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.

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.

Opening the homepage sets 6 cookies, 4 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 11 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.