What challenges come with frontend frameworks like performance and SEO?

Frontend frameworks introduce specific challenges that require deliberate engineering to manage. JavaScript bundle size is the primary performance concern: a React or Vue application that ships a large, unoptimized JavaScript bundle to the browser delays Time to Interactive significantly, negating the performance benefits the framework was supposed to provide. Code splitting, lazy loading of non-critical components, and tree shaking to remove unused code are essential mitigation techniques.

SEO presents a challenge for client-side rendered (CSR) applications because Googlebot must execute JavaScript to index content, and this process can delay indexation compared to server-rendered HTML. Using Next.js with SSR or SSG resolves this by pre-rendering pages on the server. Additional challenges include hydration mismatches (where server-rendered and client-rendered content diverge), accessibility issues introduced by JavaScript-managed focus and routing, and increased build pipeline complexity compared to simpler static site approaches.