Why is my Lovable website slow?

Slowness is usually caused by large unoptimised images, too much data fetched at once, or heavy client-side rendering — profile it with Lighthouse/DevTools before asking Lovable to fix anything.

Why does my Lovable app get slower as I add features?

Each new feature can add its own data fetches, dependencies, and re-renders that compound over time — without periodic clean-up, an app accumulates weight even if each individual change seems small.

How do I improve Lighthouse scores?

Run Lighthouse to find your worst-scoring category, fix the top 2-3 flagged issues (usually images, unused JavaScript, or render-blocking resources), and re-run it to confirm before moving on.

How do I improve Core Web Vitals?

Focus on the three metrics Google measures — LCP (loading), INP (interactivity), and CLS (visual stability) — and fix the specific one flagged as poor, usually starting with images for LCP.

How do I improve LCP?

Largest Contentful Paint is almost always slowed by an oversized hero image or a render-blocking resource — compress/preload the largest above-the-fold element and defer everything not needed for first paint.

Why are images loading slowly?

Images usually load slowly because they're uploaded at full camera/design resolution, in an uncompressed format, and without lazy-loading or a CDN — the fix is compression, correct sizing, and modern formats.

How do I optimise images?

Resize images to their actual display size, compress them, convert to WebP/AVIF where practical, and lazy-load anything below the fold — ask Lovable to apply this across the project, not just one page.

How do I lazy-load images?

Ask Lovable to add native lazy-loading to images below the fold while keeping the hero/first-visible image loading eagerly, so visitors aren't downloading offscreen images before they're needed.

Why is my database making so many requests?

Usually a component is re-fetching data on every render, a page is running the same query multiple times, or you're fetching entire tables instead of what's actually needed — ask Lovable to audit data-fetching patterns.

How do I reduce unnecessary database calls?

Fetch only what a page needs, cache results, batch requests, and let Postgres do filtering instead of pulling whole tables into the client.

Why is my dashboard slow?

Dashboards are usually slow because they run several unoptimised queries at once, re-render on every state change, or load large charts and images without lazy loading.

Why does my app become slow with more users?

Slowdowns under load usually mean missing database indexes, no rate limiting, or queries that scale linearly with row count instead of being paginated.

How do I find unnecessary React renders?

Use React DevTools' Profiler and the 'Highlight updates' setting to see which components re-render too often, then fix unstable props, missing memoisation, or state stored too high in the tree.

How do I remove unused code?

Ask Lovable to search for unused components, imports and dependencies, or run a tool like ts-prune/depcheck via the terminal, then remove what's confirmed unused and re-test.

How do I audit a Lovable project's performance?

Combine a browser Network/Performance trace, a React DevTools profile, and a query review of your Supabase schema — then ask Lovable to fix the specific issues found rather than 'optimise everything'.

How do I speed up a Lovable website?

Last checked 31 Aug 2026

Short answer

Compress and lazy-load images, fetch only the data each page needs, remove unused dependencies, and ask Lovable to run a performance/codebase audit to find the highest-impact fixes.

Start with measurement

Run Lighthouse or PageSpeed Insights first so you're fixing the actual bottleneck, not guessing.

High-impact fixes, roughly in order

Images: compress, resize to the display size, use modern formats (WebP/AVIF), and lazy-load anything below the fold.
Data fetching: only query the columns/rows a page needs; avoid fetching on every re-render; cache where sensible.
Code splitting: split rarely-used routes/components so the initial bundle is smaller.
Remove dead weight: unused libraries, duplicate UI components, or debug code left in from earlier iterations.
Defer non-critical scripts: analytics, chat widgets, and similar third-party embeds shouldn't block first render.

Ask Lovable directly

Audit this project for performance. Identify the largest images, any unnecessary data fetching, and unused code, then suggest fixes ranked by impact. Don't change anything until I confirm.

Apply the top few fixes, then re-run Lighthouse to confirm real improvement before moving to the next.

Table: quick reference

Area	Typical fix
Images	Compress, resize, WebP, lazy-load
Data	Select only needed columns, avoid redundant fetches
Bundle size	Code-split, remove unused packages
Rendering	Fix unnecessary re-renders
Third-party scripts	Defer or load async

What usually goes wrong

Chasing a Lighthouse score number instead of real user experience — a 100 score with a broken layout helps no one.
Optimising once and never again; performance regresses as features are added, so treat this as a periodic check, not a one-off.
Adding heavy dependencies for small features (e.g. a full charting library for one static chart).

If the app has grown large and audits keep surfacing the same issues, PromptSites.com can do a proper performance pass.

Sources

Test and verify your app

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You might also need

GuideHow to Improve Lovable Loading SpeedFind the actual cause of a slow project — images, queries, waterfalls or scripts — before changing anything.