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 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 Lighthouse scores?

Q: 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.

Last checked 31 Aug 2026

Short answer

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.

Run the report

Use Chrome DevTools → Lighthouse, or pagespeed.web.dev, on both mobile and desktop — scores often differ significantly between them.

What the categories mean

Performance: load speed and responsiveness — usually the score people mean by "Lighthouse score".
Accessibility: contrast, labelling, keyboard navigation.
Best Practices: security headers, console errors, image aspect ratios.
SEO: meta tags, crawlability, mobile-friendliness.

Fixing the Performance score

Lighthouse lists specific "opportunities" ranked by estimated impact. Common ones in Lovable apps:

Properly size and compress images — usually the single biggest win.
Eliminate render-blocking resources — defer non-critical scripts/styles.
Reduce unused JavaScript — remove dead code or unused libraries.
Minimise main-thread work — often caused by heavy client-side logic running on load.

Prompting Lovable

Lighthouse flags [paste the specific opportunities listed]. Fix these starting with the highest estimated impact, and don't touch anything else.

What usually goes wrong

Chasing a perfect 100 instead of meaningful real-world speed — diminishing returns set in fast after the big wins.
Fixing Accessibility or SEO issues while ignoring Performance, when Performance is usually what "slow site" complaints are actually about.
Not re-running Lighthouse after each fix, so you can't tell which change actually helped.
Testing only on desktop — mobile scores are usually much lower and matter more for real visitors.

See /questions/how-do-i-improve-core-web-vitals for the metrics Lighthouse's performance score is built from.

Sources

Was this answer helpful?

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.