Practical know-how on frontend, AI tools and software development.
Core Web Vitals in 2026 still consist of three metrics: LCP for loading the main content, INP for interaction responsiveness and CLS for layout stability. The scores alone do not tell you what to fix. Effective optimization requires separating real-user field data from lab tests, finding the actual LCP element, slow interaction or layout shift source, and then monitoring the result after deployment.
SSR, CSR, SSG and ISR differ mainly in where and when HTML is generated. For SEO, the key question is whether important content and metadata are available without waiting for client-side JavaScript. For performance, server cost, caching, JavaScript execution, hydration and freshness matter as well. In 2026, the best architecture is usually not one rendering mode for an entire application, but a strategy selected for each route or even each part of a route.
Image format still matters. A 1.8 MB hero photograph can be the main cause of poor LCP, while a lossless PNG used for photographic content can be many times heavier than a carefully encoded WebP or AVIF file. On the other hand, aggressively converting every asset to the newest format can reduce text sharpness, increase build cost or cause problems in older clients and external publishing systems.
Performance is not only a technical topic. Slow pages cost leads, harm SEO, and erode trust, and the things that fix them are usually small, specific, and boringly consistent.
