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Why website speed matters and what slows it down
By Omnicode•October 9, 2026
A slow site loses visitors. What Core Web Vitals measure, the usual causes of slowness and the first things to fix.
People leave a page that does not respond. A fast site keeps visitors on the page and makes it easier for search engines to read it. Here is what slows a site down and what to fix first.
What Core Web Vitals measure
- LCP (Largest Contentful Paint). How quickly the main content appears.
- INP (Interaction to Next Paint). How quickly the page reacts when someone taps or clicks.
- CLS (Cumulative Layout Shift). Whether elements jump while the page loads.
The usual causes of slowness
- Large, uncompressed images.
- Too many plugins and scripts, especially from third parties.
- Slow hosting or no caching.
- Fonts and effects loaded without need.
What to fix first
Resize and compress images, remove plugins you do not use, enable caching and load scripts only where they are needed. You can measure the result with Google's PageSpeed Insights, which shows these metrics for a given address.
Speed is part of every site I build. See website development in Bratislava or write to me if your current site feels slow.