paessler.com website review

Google Tag Manager costs a phone 1.1 s of main-thread work and 561 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.

3 files block the first paint until they finish downloading. Deferring or inlining them could save about 1.1 s.

A phone's processor spends 4.6 s on main-thread work while loading, 2.6 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

8 third-party services load with your homepage (Google Tag Manager, Kameleoon and Hubspot and others), adding 1.0 MB and 1.8 s of main-thread time.

40 files are served with short cache lifetimes, so returning visitors download them again (337 KiB).

Your mobile performance score is 62 (desktop: 83). Pages that score under 90 lose visitors before the first paint.

17 long tasks block the main thread while loading, the longest for 331 ms. During a long task the page ignores taps.

Kameleoon costs a phone 287 ms of main-thread work and 53 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 276 KiB of JavaScript is downloaded but never used on this page.

About 23 KiB of CSS is downloaded but never applied on this page.

Polyfills for old browsers add 18 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.

Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

The page becomes fully interactive after 13.8 s. Good is under 3.8 s.

Scripts block taps and scrolling for 1.3 s in total while the page loads. Good is under 200 ms.

Your largest element takes 3.5 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “Complete Network Monitoring. Zero Blind Spots.”.

The first text or image appears after 2.3 s on a phone. Good is under 1.8 s.

Visually, the page fills in at 3.6 s (Speed Index). Good is under 3.4 s.

Over the last 25 four-week periods to 2026-10-24, real Chrome visitors' tap response (inp) went from 138 ms to 140 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-10-24, real Chrome visitors' largest content (lcp) went from 2.5 s to 2.6 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

1 image (43 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: 45.5 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

2 buttons have no accessible name, so screen readers announce just “button”.

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

3 tap targets are too small or too close together to hit reliably with a finger.

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

All page content should be contained by landmarks: 49 elements on the page fail this check, rated moderate by axe-core.

2 form fields have no label, so screen readers announce an empty box and autofill guesses.

Headings skip levels (h1 → h4, h2 → h4 and h2 → h4), which makes the page harder to scan with a screen reader.

Elements with visible text labels do not have matching accessible names. (1 element).

Your meta description is 184 characters; Google truncates after about 160, so the end of your pitch is cut.

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

The homepage links to 161 pages on paessler.com and 12 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 https://www.paessler.com/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.

/, https://www.paessler.com/de, https://www.paessler.com/es, https://www.paessler.com/fr, https://www.paessler.com/it and https://www.paessler.com/br all use the title “Paessler - The Monitoring Experts”. Search engines can't tell which page to show for a search, so each competes with the others.

We fetched 15 pages linked from your homepage (of 93 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=5295718&Ver=2&mid=1586b744-061e-4c4a-82ee-bda23c93feef&bo=2&sid=b9bd37e0d25311f1a377376b54f683c1&vid=b9bda760d25311f18cb4d5f24a7a63e3&vids=1&msclkid=N&pi=918639831&lg=.

The page uses 1 deprecated browser API that will stop working in future browsers (“Synchronous `XMLHttpRequest` on the main thread is deprecated because of its detrimental effects to…”).

1 error was logged to the browser console while the page loaded, for example “Failed to load resource: net::ERR_FAILED”.

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 1,236 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, HubSpot and LinkedIn Insight and 1 more (measured from a US location before any click). A consent tool (OneTrust) is installed; check it blocks these until visitors agree where the law requires it.

Opening the homepage sets 13 cookies (measured from a US location before any click).

Loading the homepage contacts 31 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.