What are the main metrics that affect UX?

Main metrics that directly affect user experience (UX):

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#1. Loading speed (Page Load Time)

The faster a page opens, the less irritation and the higher the engagement. Critical for the first 3 seconds.

#2. Time to Interactive

What matters is not only when the site "appears", but when it can actually be used (buttons, forms work). If it looks nice but is not clickable, UX suffers.

#3. Core Web Vitals (per Google)

• LCP (Largest Contentful Paint): how fast the main visible block loads
• FID (First Input Delay): the delay before the first response to a click
• CLS (Cumulative Layout Shift): how much everything jumps around during loading

#4. Responsiveness and mobile version

UX breaks if a phone user has to scroll sideways, zoom the font, or close banners.

#5. Ease of navigation

Clear structure, logical flow between pages, uncluttered menus, understandable buttons.

#6. Visual hierarchy

The user should immediately understand what matters, what is clickable, and where to look.

#7. Accessibility

How easy it is for people with limitations to use the site (contrast, alt text, keyboard control).

#8. Cognitive load

If a site requires thinking, searching, or guessing, that is bad UX.

#9. Interface reliability

No bugs, freezes, or sudden data loss, the basis of basic trust.

#10. Personalization / content relevance

UX improves when the interface and information adapt to the user.

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Summary: UX is not about being "beautiful", it's about being "clear, fast, convenient, and stable". Anything that gets in the way of these four qualities makes the experience worse.