Observed Signal · May 3, 2026 · Platform Migration · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Rsale.net Frontend Rewritten from Next.js to SvelteKit
Rsale.net rewrote its frontend, replacing Next.js 15 / React 19 with SvelteKit 2 and Svelte 5 (runes). The rewrite aimed to reduce bundle size, simplify server/client rendering decisions, and improve developer experience. Measured improvements in the developer environment include faster cold starts (≈8s → ≈1.5s), much faster production builds (≈3min → ≈25s), quicker HMR, and a drop in baseline homepage JavaScript from ~99 kB to ~38 kB. The backend (ASP.NET Core microservices and AI translation) remained unchanged; SignalR continues to provide chat with an upgrade to @microsoft/signalr v10. The new stack uses Vite 7, @sveltejs/adapter-node, Drizzle ORM for front-end reads, and Vitest + Playwright for tests. The site currently shows test data while backend work finishes.
Practical case study showing measurable frontend performance and DX gains from migrating to SvelteKit; useful reference for small-to-medium content-heavy, SSR-focused consumer platforms but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Rsale.net migrated its frontend from Next.js 15 / React 19 to SvelteKit 2 and Svelte 5 (runes).
- Baseline frontend JS on the homepage dropped from approximately 99 kB to ~38 kB after the rewrite.
- Developer environment metrics: cold dev start reduced from ~8 s to ~1.5 s; production build time reduced from ~3 min to ~25 s; HMR improved from 300–800 ms to 30–80 ms.
- Backend (ASP.NET Core microservices) and AI Translation Service were not changed by the frontend rewrite; SignalR remains for chat (migrated from @microsoft/signalr v9 to v10).
- Stack changes include Vite 7 as the bundler, @sveltejs/adapter-node for deployment, Drizzle ORM for front-end reads, and tests added via Vitest + Playwright.
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