educeth.ch website review

2 files block the first paint until they finish downloading. Deferring or inlining them could save about 5.4 s.

11 files are served with short cache lifetimes, so returning visitors download them again (872 KiB).

About 425 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 2.1 s faster on a phone.

2 images could be 181 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 1.1 s faster on a phone.

Your mobile performance score is 54. Pages that score under 90 lose visitors before the first paint.

Web fonts hide text while they load. Setting font-display: swap shows text immediately (about 700 ms).

About 100 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 460 ms faster on a phone.

4 long tasks block the main thread while loading, the longest for 283 ms. During a long task the page ignores taps.

2 third-party services load with your homepage (Google Tag Manager and Optanon), adding 444 KiB and 227 ms of main-thread time.

Polyfills for old browsers add 14 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.

Your largest element takes 10.0 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

The first text or image appears after 5.3 s on a phone. Good is under 1.8 s.

The page becomes fully interactive after 10.0 s. Good is under 3.8 s.

Visually, the page fills in at 6.4 s (Speed Index). Good is under 3.4 s.

Scripts block taps and scrolling for 236 ms in total while the page loads. Good is under 200 ms.

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

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' tap response (inp) went from 99 ms to 108 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' largest content (lcp) went from 1.1 s to 1.0 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

image.imageformat.1286.1298459845.jpg 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).

1 image is downloaded at several times the size a phone draws it, for example image.imageformat.1286.1298459845.jpg at 1,829 px wide, shown at 296 px. Resized copies would save about 116 KiB.

2 images (203 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 0.49 g of CO₂e: 59.3 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

All page content should be contained by landmarks: 14 elements on the page fail this check, rated moderate by axe-core.

The skip-link target should exist and be focusable: 1 element on the page fails this check, rated moderate by axe-core.

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

No meta description, so Google writes its own snippet from whatever text it finds.

Your title is 76 characters, so Google will cut it off around 60: “Homepage – EducETH - ETH-Kompetenzzentrum für Lehren und Lernen | ETH Zürich”.

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

No XML sitemap at https://educ.ethz.ch/sitemap.xml, so Google discovers your pages only by following links.

There is no robots.txt at educ.ethz.ch/robots.txt, the first file search crawlers ask for.

1 link use generic text like “click here” or “learn more”, which tells Google nothing about the page behind it.

Open Graph is missing og:description, so shared links fall back to guesses.

No twitter:card tag. X falls back to Open Graph, which is incomplete here.

The homepage links to 16 pages on educeth.ch and 25 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.

The HTML your server sends has 127 of the 236 words a browser shows. AI crawlers don't run JavaScript, so they miss the rest.

There is no https://educ.ethz.ch/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://educ.ethz.ch/footer/barrierefreiheitserklaerung.html, https://educ.ethz.ch/footer/disclaimer-copyright.html and https://educ.ethz.ch/footer/datenschutz.html are marked noindex but linked from your homepage. If they are meant to be found, remove the noindex.

https://educ.ethz.ch/utils/kontakt.html, https://educ.ethz.ch/footer/inhaltsverzeichnis.html, https://educ.ethz.ch/footer/impressum.html and https://educ.ethz.ch/footer/disclaimer-copyright.html have no meta description, so Google writes the search snippet from whatever text it finds.

https://educ.ethz.ch/footer/inhaltsverzeichnis.html has no <h1> headline, so visitors and search engines get no clear main topic.

https://educ.ethz.ch/utils/kontakt.html and https://educ.ethz.ch/footer/inhaltsverzeichnis.html 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 6 pages linked from your homepage and read each the way a search engine does.

9 of 25 tappable elements near the top of the page are smaller than 24 px, hard to hit with a thumb.

Large scripts ship without source maps.

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.

No testimonials, customer logos, ratings or customer counts on the homepage: nothing tells a new visitor that others already trust you.

No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.

The homepage has only about 236 words of visible text; thin pages give Google and first-time buyers little to go on.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

Before a visitor clicks anything, the page loads Google Tag Manager (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 1 cookie (measured from a US location before any click).

Loading the homepage contacts 3 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.