dotsource.de website review

Your mobile performance score is 77. Pages that score under 90 lose visitors before the first paint.

4 files block the first paint until they finish downloading. Deferring or inlining them could save about 800 ms.

7 images could be 584 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

3 third-party services load with your homepage (Wistia, Sentry and Mux), adding 4.3 MB and 145 ms of main-thread time.

Wistia costs a phone 140 ms of main-thread work and 4.2 MB 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 29 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.

About 95 KiB of JavaScript is downloaded but never used on this page.

1 long task block the main thread while loading, the longest for 89 ms. During a long task the page ignores taps.

Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

The layout shifts by 0.361 while loading, so content jumps under the reader's thumb. Good is under 0.1.

The page becomes fully interactive after 6.9 s. Good is under 3.8 s.

Visually, the page fills in at 4.6 s (Speed Index). Good is under 3.4 s.

Your largest element takes 2.6 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “Digitalagentur dotSource Wir sind Ihr Spezialist für digita…”. Most of its time is resource load delay (1.0 s).

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

Over the last 25 four-week periods to 2026-10-24, real Chrome visitors' tap response (inp) went from 172 ms to 172 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 6.9 MB in 73 requests on a phone: media 4.3 MB (1), images 1.2 MB (25) and other files 982 KiB (6). Under 2 MB keeps phones on slow connections fast.

1 image further down the page (406 KiB) download before anyone scrolls to it. Adding loading="lazy" lets the first screen load first.

1 image is downloaded at several times the size a phone draws it, for example KI_Assistenten_agentische_KI.jpg at 1,350 px wide, shown at 414 px. Resized copies would save about 62 KiB.

1 image (406 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 1.97 g of CO₂e: 235.9 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

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

The homepage links to 138 pages on dotsource.de and 23 external pages.

We fetched 15 pages linked from your homepage (of 105 found) and read each the way a search engine does.

HSTS is set, but max-age is 180 days; one year is the recommended minimum.

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

2 links go through two or more redirects, for example https://www.xing.com/companies/dotsourcegmbh.

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

dotsource.de 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.

On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.

We found no call-to-action buttons or links (such as “Book a demo” or “Get a quote”) anywhere on the homepage.

Your homepage shows a map 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.

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 646 words of visible text.

dotsource.de 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.

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.

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 1 host run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.