Büro Haeberli. Agentur für Grafik und Web. Zürich

What Dr Urls found on buerohaeberli.ch

From the audit of their public home page on 22/10/2026, worst first. Each links to what it means and how it is fixed.

• high
  Time to First Byte (TTFB) is slow

  TTFB directly impacts all subsequent loading metrics.

• medium
  Canonical URL is relative instead of absolute

  Relative canonical URLs can be misresolved by search engines in certain edge cases, especially when pages are accessed through proxies, CDNs, or alternative domains.

• medium
  Duplicate ID attributes found

  Duplicate IDs cause label elements, aria-labelledby, aria-describedby, and fragment link targets to associate with the wrong element.

• medium
  Images missing width and height attributes

  Missing image dimensions are the leading cause of Cumulative Layout Shift (CLS), a Core Web Vital and ranking factor.

• medium
  Link has empty anchor text

  Anchor text is one of the strongest signals search engines use to understand the content of the linked page.

• medium
  No structured data (schema.org) found

  Structured data enables rich results (star ratings, FAQ dropdowns, recipe cards, product prices, breadcrumbs, etc.) that dramatically increase click-through rates — some rich resu…

• medium
  Scripts without async or defer

  Synchronous scripts halt HTML parsing while the browser downloads and executes them.

• low
  Internal link has nofollow attribute

  Using nofollow on internal links wastes PageRank.

• low
  Missing preconnect hints for critical origins

  Each new origin connection requires DNS resolution, TCP handshake, and TLS negotiation, adding 100-300ms of latency.

• low
  Multiple H1 headings on page

  Multiple H1 tags can dilute the topical focus of the page.

• low
  Twitter Card meta tag missing

  Twitter Card tags enable rich media previews when your page is shared on Twitter/X.

• low
  X-Content-Type-Options header missing

  Without this header, browsers may interpret files as a different content type than intended, which can lead to XSS attacks when a malicious file is interpreted as executable scrip…

8 security findings are not listed on this public page; the site's owner sees them in a full audit after claiming it.