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.

How do I speed up a Lovable website?

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.

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 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 improve Core Web Vitals?

Last checked 31 Aug 2026

Short answer

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.

The three metrics

Metric	Measures	Typical fix
LCP (Largest Contentful Paint)	How fast the main content appears	Compress/preload hero images, reduce render-blocking resources
INP (Interaction to Next Paint)	How responsive the page feels to clicks/taps	Reduce heavy JavaScript running on interaction, avoid large re-renders
CLS (Cumulative Layout Shift)	How much content jumps around while loading	Set explicit width/height on images and embeds, reserve space for ads/dynamic content

Where to check your scores

Chrome DevTools → Lighthouse (lab data, immediate).
Google Search Console's Core Web Vitals report (real-user field data, if the site has traffic).
PageSpeed Insights for both.

Fixing in Lovable

Identify which metric is poor, then ask specifically:

My Core Web Vitals report flags [LCP/INP/CLS] as poor. Find what's causing it on [page] and fix that specifically.

For LCP, that's usually the hero image or a slow-loading font. For CLS, it's usually an image or embed without reserved dimensions. For INP, it's usually a heavy script or unnecessary re-render triggered by an interaction.

What usually goes wrong

Optimising all three at once instead of the one actually flagged as poor — field data (real visitors) matters more than lab data for prioritising.
Fixing CLS by removing dynamic content entirely instead of just reserving space for it.
Ignoring mobile field data — Core Web Vitals are usually worse on mobile and that's what Google weighs for search ranking.

See Google's own Core Web Vitals documentation for full metric definitions and thresholds.

Sources

Understanding Core Web Vitals

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