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Site speed and Core Web Vitals: what actually moves the metrics

Core Web Vitals are three metrics with which search engines measure not abstract "speed" but concrete sensations: is the content visible quickly, does the page answer clicks, does the layout jump under your hands.

LCP — how fast the main thing appears

Time until the largest element of the first screen is painted. It is usually ruined by a heavy hero image without a modern format and explicit dimensions, less often by fonts and third-party scripts loading ahead of the content.

INP — how fast the page responds

The delay between a user action and a visible reaction. The main source of trouble is excess JavaScript: analytics, chat widgets, maps and sliders executing at the exact moment someone tries to press a button.

CLS — how much the layout shifts

Blocks moving after loading has started. Usually images and ad slots without reserved space, plus fonts that get swapped on the fly.

What we do on our side

  • Serve static pages instead of assembling them on every request.

  • Convert images to WebP and always set dimensions.

  • Inline the critical CSS and defer everything not needed above the fold.

  • Load third-party scripts after interactivity, not before it.

Metrics are worth reading on real users, not only in a lab test: the gap between a developer laptop and a visitor phone is usually the real problem.

FAQ

Answers to the most popular questions

LunoWeb specializes in creating websites under key, designing user interfaces, SEO optimization and technical support. We develop solutions adapted to the goals of your business: from landing pages to complex online stores.

The timeline depends on the complexity of the project. A simple website can be ready in 7-14 days, more complex solutions — from 6 to 12 weeks. We always meet deadlines and keep the client informed about all stages of work.

The price is calculated individually and depends on the tasks: type of website, volume of design, functionality and integration. We offer both budget solutions and comprehensive products under key with a detailed technical specification.

Yes, we immediately incorporate technical SEO optimization: adaptability, fast loading, correct header structure, meta tags and human-readable URLs. We also provide comprehensive SEO promotion on request.

Of course. We develop UX/UI design in Figma according to all standards and transfer it to your team or programmers. We can also adapt the design to your technical requirements.

Yes, we cooperate with clients from different countries. All work is carried out online: you get access to the chat with the team, regular reports and the ability to make changes at any stage.

We combine design, development and marketing thinking. Our team consists of experienced specialists, each project undergoes quality control, and the result is not just a website, but a tool for the growth of your business.