Web performance: speed as a key conversion factor
Nemsi Media
Published on 2026-03-10
Web performance is no longer optional. Google uses Core Web Vitals as a ranking factor, and users expect pages to load in under 3 seconds.
A fast website directly improves your conversion rate. According to studies, every second gained can increase sales by 7%.
Unoptimised images are the number-one cause of slowdowns. Use modern formats (WebP, AVIF), lazy loading and a CDN for immediate results.
Excess JavaScript slows rendering. Favour server-side rendering (SSR) and static generation (SSG) with Next.js for optimal performance.
Measure before optimising with PageSpeed Insights, Lighthouse and real visitor data. First address the main element that is too slow, layout shifts and delayed interactions. Then set a performance budget for images, fonts and third-party scripts, and monitor it with every release to avoid gradual degradation.
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