Introduction

Web performance is no longer optional.
It directly affects:

• search engine ranking
• conversion rates
• user retention
• perceived quality
• accessibility
• global user experience

In the 2010s, developers often built first, optimized later.
But today’s applications are too complex, and users too impatient, for that approach.

Performance now must be built into the architecture. Not an add-on.

This is why modern frameworks and platforms—from Next.js to Astro to Nuxt to SvelteKit—prioritize: