Checklist

A lightning-fast website?
Start with our checklist.

A fast website isn’t just a trend; it’s the difference between ‘I’ll buy’ and ‘I’m leaving.’ The numbers confirm it, and businesses feel the impact.

Thanks to the improved speed of deNatura.cz, we at PageSpeed.ONE managed to increase traffic from Google by 17.3%.
Loading in one second? That’s 6 times higher conversion than loading in four seconds. We measured this with a large e-commerce site.
On the site, we achieved a 25% increase in conversion rates through relatively simple changes.
If a page meets Core Web Vitals, it’s 24% less likely that a user will leave before it loads.
Faster websites often have lower PPC advertising costs. This was evident after optimizing Livesport.

Speed isn't magic. It's a craft.
And we at PageSpeed.ONE excel at it. Check out our monitoring, services, or let's talk directly.

Speed isn’t just a developer issue. It involves everyone – developers, designers, marketers, and managers. Tame the chaos.

Always have monitoring enabled. Detect issues early, prevent random declines.
Convince management that speed is a crucial business topic.
Have a performance manager in your company who actively addresses and advances this topic.
Set the right metrics; for larger sites, go beyond Core Web Vitals.
Educate all stakeholders, including marketers, content editors, and designers.
Consider speed impact when designing new features and selecting third-party solutions.
TIP: Watch the introductory video on Performance Culture.

LCP measures when the most important content appears on your page. You have 2.5 seconds to achieve this.

INP measures how quickly your website responds to clicks. The threshold is 200 milliseconds.

Eliminate long tasks in JavaScript. Long Tasks are measured by the TBT metric.
Defer loading non-critical code. If it's not needed for the first render, postpone it.
Tame your frameworks. Check out our guides on optimizing React or Vue.
Optimize third-party scripts, like GTM. They can sometimes cause delays.
Occasionally use a trick with setTimeout() to break long tasks into smaller ones.
TIP: Inform users after they click that the action will take time. See more options for INP optimization.

CLS monitors if your page is shifting unexpectedly. The target is a score of 0.1.

Reserve space. Always set width/height for images. Also, reserve space for other elements.
Allocate space for fonts. Use CSS to prevent shifts during font loading.
TIP: Animate modernly, always with transform. Check out more CLS optimizations.

Chcete další důležité technické tipy, které mohou ovlivnit více metrik?

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