Performance Tools for Core Web Vitals and Pagespeed
Single tools for typical performance questions: TTFB, LCP, INP, CLS, render blocking, JavaScript, images, caching, compression and third-party scripts. Each tool checks a URL for free and leads to a joint website audit with up to 20 URLs for free and up to 2,500 URLs after one-time unlock.
TTFB Checker
Measure time to first byte, redirects, HTTP version and total HTML time of a URL.
Core Web Vitals Checker
Technical pre-checking of resource, JavaScript and layout signals. No measured LCP, INP or CLS values.
LCP Checker
Pre-check LCP risks based on server response, resources and image priority. The actual LCP is not measured.
INP Checker
Pre-check JavaScript and third parties as interaction risks. No browser interactions or measured INP values.
CLS Checker
Pre-check missing image and iframe dimensions as layout risks. Actual shifts and CLS are not measured.
Render Blocking Checker
Identify blocking stylesheets and synchronous scripts that brake First Paint and LCP.
JavaScript Performance Checker
External scripts, inline blocks, known JS sizes and Async/Defer signals.
Image Performance Checker
Check image weight, lazy loading, image dimensions and prioritization of hero images.
Cache and Compression Checker
Evaluate cache control, expires, content encoding and asset caching signals.
Third Party Script Checker
Make external hosts, tracking tags, widgets and third-party scripts visible.
Core Web Vitals Audit
Up to 2,500 URLs, full performance table, prioritized finds and CSV export after unlock.
Which performance tool fits which problem?
Server or start loading slowly
Start with the TTFB Checker. High values indicate backend, caching, CDN or redirect problems.
Core Web Vitals Overall Unclear
The Core Web Vitals Checker prioritizes LCP, INP and CLS as an entry point before individual special tools are used.
JavaScript or Third Party Brakes
Use the INP Checker, JavaScript Checker and Third Party Script Checker for bundle and tag risks.
Images, CLS or LCP striking
The Performance Checker, LCP Checker and CLS Checker image reveal typical image and layout problems.
Free individual tools as an introduction to the premium audit
Many users are not looking for a website audit, but for a specific problem: measuring TTFB, checking LCP, avoiding CLS, reducing JS or testing caching.
The individual tools answer this search intention directly. If multiple URLs or templates are affected, the next step leads to the Core Web Vitals audit with paywall, CSV export and unlock.
Questions about the Performance Tools
Are the performance tools free?
Yes. The standalone tools check a single URL. The joint website audit starts with up to 20 URLs for free. Full results and exports can be obtained with the one-time unlock for 99 € net or the SEO Suite from 19 € net monthly.
Why are there so many individual performance tools?
Each tool serves a specific search intention: TTFB, LCP, INP, CLS, render blocking, JavaScript, images, caching or third party scripts.
Are the values true Core-Web-Vitals field data?
No. The tools provide technical pre-testing from the Seitenreport system. Field data from Search Console, CrUX or RUM should be used in addition.
When do I need the premium audit?
As soon as multiple URLs, templates, shops, categories or relaunch routes are to be evaluated. The audit shows patterns, priorities and export data.