cwi.edu website review

5 files block the first paint until they finish downloading. Deferring or inlining them could save about 1.2 s.

8 third-party services load with your homepage (Google Tag Manager, Facebook and 451.io and others), adding 1.3 MB and 1.1 s of main-thread time.

Your mobile performance score is 51. Pages that score under 90 lose visitors before the first paint.

11 files are served with short cache lifetimes, so returning visitors download them again (740 KiB).

Google Tag Manager costs a phone 686 ms of main-thread work and 486 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 122 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 600 ms faster on a phone.

About 518 KiB of JavaScript is downloaded but never used on this page.

13 long tasks block the main thread while loading, the longest for 361 ms. During a long task the page ignores taps.

A phone's processor spends 3.1 s on main-thread work while loading, 1.6 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

451.io costs a phone 137 ms of main-thread work and 570 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.

2 images could be 23 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.

Polyfills for old browsers add 13 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 8.9 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image “Student wearing a backpack standing outside a campus buildi…”.

The page becomes fully interactive after 19.7 s. Good is under 3.8 s.

Scripts block taps and scrolling for 802 ms in total while the page loads. Good is under 200 ms.

The layout shifts by 0.111 while loading, so content jumps under the reader's thumb. Good is under 0.1.

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

Over the last 25 four-week periods to 2026-10-24, real Chrome visitors' tap response (inp) went from 149 ms to 158 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 3.3 MB in 85 requests on a phone: scripts 1.4 MB (25), other files 1.1 MB (31) and fonts 433 KiB (3). Under 2 MB keeps phones on slow connections fast.

By the Sustainable Web Design model, a visit to your homepage emits about 0.94 g of CO₂e: 112.9 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

Banner landmark should not be contained in another landmark: 1 element on the page fails this check, rated moderate by axe-core.

Document should not have more than one banner landmark: 1 element on the page fails this check, rated moderate by axe-core.

1 form field has no label, so screen readers announce an empty box and autofill guesses.

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

The homepage links to 96 pages on cwi.edu and 18 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.

We fetched 15 pages linked from your homepage (of 61 found) and read each the way a search engine does.

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

Chrome logged issues while loading the page (“Content security policy”).

Your homepage shows a street address but no LocalBusiness JSON-LD, so Google and AI assistants have to guess your address, hours and phone from the page text.

The homepage shows no opening hours. If customers visit or call, show when.

There is no link to Google or Apple Maps. A directions link is one tap for a phone visitor.

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 370 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, LinkedIn Insight and Meta Pixel 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 18 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 22 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.