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Optimization••11 min. read

Why website speed directly determines your number of inquiries and sales

Today's internet user is impatient. Studies by Google and Deloitte show that when a website's load time increases by just 1 second, conversions drop by up to 20%, and the bounce rate rises by more than 30%. Website performance is no longer just a technical metric for developers — it's a direct factor in your business's revenue.

1. How speed affects Google rankings (Core Web Vitals)

Google officially uses Core Web Vitals metrics as a ranking factor:

LCP (Largest Contentful Paint): how long it takes for the main content block to appear on screen. Target: under 2.5 seconds (Next.js achieves under 0.8s).

INP (Interaction to Next Paint): how quickly the website responds to a click. Target: under 200 ms.

CLS (Cumulative Layout Shift): whether elements jump around on screen while the page loads. Target: under 0.1.

2. How is maximum speed achieved?

Image optimization: Images are automatically converted to next-generation AVIF and WebP formats, reducing their size by up to 80% without any loss of quality.

Static generation (SSG) and edge CDN: HTML is served from the server closest to the user, with no delay.

Font and code compression: No heavy third-party scripts or libraries that block the browser from rendering.

3. How to check your website's speed

The free Google PageSpeed Insights tool shows your website's score (0–100) on both mobile and desktop within seconds, while pointing out specific problems — oversized images, inefficient hosting, or render-blocking scripts.

We recommend running this test regularly, especially after any major changes to your website — a new plugin, an extra script, or a large image upload — since a single unoptimized element can drop your score by dozens of points.

4. The impact of third-party scripts

Google Analytics, the Facebook Pixel, live chat widgets, and other third-party tools are useful, but each one adds extra code weight. It's important that these scripts load asynchronously (without interrupting the rendering of your main content) and only after user consent, as required by GDPR and the ePrivacy Directive.

Smart script management is one of the most commonly overlooked, yet most impactful, speed optimization factors on large business websites.

Key Takeaways

  • A fast website = higher Google rankings and more orders.
  • Next.js static generation ensures instant loading even on a weak mobile connection.
  • Check your speed regularly with Google PageSpeed Insights, especially after making changes to your site.
V

Viktor Seto

Founder & Lead Developer @ SiteStudio

Passionate about building blazing-fast websites, custom web applications, and business workflow automations. Direct contact with clients without agency overhead.

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