Design solves the problem of convincing the visitor who has arrived. Performance and SEO solve the problem of getting them to arrive.
Performance: load time is a business decision
Data from Google and Vodafone:
- 53% of mobile users abandon a site that takes more than 3 seconds to load
- Every second of improvement in load time increases conversion by 1 to 7%
- Sites with an LCP above 4s see a significant drop in Google rankings
This isn't a technical detail. It's measurable revenue loss.
Core Web Vitals: what Google measures
Google uses three metrics to evaluate user experience:
LCP (Largest Contentful Paint): how long it takes for the largest element on the page to appear. Target: under 2.5s.
CLS (Cumulative Layout Shift): how much the page "jumps" while loading. Target: under 0.1.
INP (Interaction to Next Paint): how quickly the page responds to the user's click. Target: under 200ms.
Sites with good metrics rank higher. Sites with poor metrics lose position to competitors with similar content.
The most common causes of slowness
Unoptimized images: a 3MB image where a 200KB one would do. Next.js Image solves this automatically.
Excessive JavaScript: large libraries loaded unnecessarily. Every extra KB of JS is processing on slow devices.
Fonts without preload: the font loads after the text, causing a flash of unstyled content. Fixable with font-display and preload.
Slow server: high server response time (TTFB). CDN and edge computing solve it.
SEO: showing up for people who are searching
SEO isn't a trick. It's making sure Google understands what your content solves and for whom.
The fundamentals that never change:
- A single H1 per page: describes the main content
- Title and meta description: control what appears in the search result
- Friendly URL: /servicos/higienizacao-sofa, not /page?id=47
- Quality content: answers real questions your user asks
- Structured data: Schema.org helps Google understand the context
The combo that works
Performance + SEO + relevant content = a digital presence that attracts and converts.
A beautiful but slow site loses visitors before showing what it has. A fast site without SEO doesn't get found. The combination of the two is what turns a website into a business asset.