< 1.5s
First Contentful Paint
90+
Lighthouse Score
-70%
Bundle Size Reduction
Core Web Vitals That Matter
Every millisecond counts for user experience and SEO
Bundle analysis and code splitting to eliminate unnecessary JavaScript
Route-based lazy loading, component-level code splitting, dynamic imports
Browser caching, service workers, CDN integration, edge caching strategies
Image optimisation (WebP, AVIF), lazy loading, responsive images, sprites
Critical CSS extraction, CSS minification, tree-shaking, unused code removal
React Server Components, streaming SSR, ISR, pre-rendering static content
Bundle bloat is the silent killer of web performance, with the average JavaScript bundle growing 45% year-over-year to over 500KB compressed. Webpack Bundle Analyzer and Rollup Visualizer expose duplicate dependencies, vendor lock-in, and unused code lurking in your builds. We implement intelligent code splitting strategies that reduce initial bundle size by 40-70%, breaking monolithic bundles into route-based chunks, vendor chunks with aggressive caching, and dynamic imports for conditional features. Tree-shaking eliminates dead code paths, whilst scope hoisting reduces module overhead. The result is sub-100KB initial bundles that load in milliseconds, not seconds.
Bundle analysis and code splitting to eliminate unnecessary JavaScript
Route-based lazy loading, component-level code splitting, dynamic imports
Browser caching, service workers, CDN integration, edge caching strategies
Image optimisation (WebP, AVIF), lazy loading, responsive images, sprites
Critical CSS extraction, CSS minification, tree-shaking, unused code removal
React Server Components, streaming SSR, ISR, pre-rendering static content
Our Performance Engineering Methodology
Data-driven optimisation with measurable results
Performance Audit
In-depth analysis using Lighthouse, WebPageTest, Chrome DevTools, and real user monitoring. We measure LCP, FID, CLS, TTFB, and TTI across devices and network conditions to establish baselines.
Bundle Optimisation
Webpack Bundle Analyzer or Rollup Visualizer reveals bloat. We eliminate duplicate dependencies, implement tree-shaking, split vendor chunks, and remove unused code. Typical reduction: 40-70%.
Code Splitting Strategy
Route-based splitting for page-level chunks, component-level splitting for heavy components (charts, editors), dynamic imports for conditional features. Users download only what they need, when they need it.
Asset Pipeline
Modern image formats (WebP, AVIF), responsive images with srcset, lazy loading with intersection observer, sprite sheets for icons. Reduce image payload by 60-80% without quality loss.
Caching & CDN
HTTP caching headers, service worker caching strategies (cache-first, network-first, stale-while-revalidate), CDN deployment with edge caching, asset fingerprinting for immutable caching.
Runtime Optimisation
React.memo for expensive components, useMemo/useCallback for heavy computations, virtualisation for long lists, debouncing/throttling for event handlers, Web Workers for background processing.
Performance Audit
In-depth analysis using Lighthouse, WebPageTest, Chrome DevTools, and real user monitoring. We measure LCP, FID, CLS, TTFB, and TTI across devices and network conditions to establish baselines.
Bundle Optimisation
Webpack Bundle Analyzer or Rollup Visualizer reveals bloat. We eliminate duplicate dependencies, implement tree-shaking, split vendor chunks, and remove unused code. Typical reduction: 40-70%.
Code Splitting Strategy
Route-based splitting for page-level chunks, component-level splitting for heavy components (charts, editors), dynamic imports for conditional features. Users download only what they need, when they need it.
Asset Pipeline
Modern image formats (WebP, AVIF), responsive images with srcset, lazy loading with intersection observer, sprite sheets for icons. Reduce image payload by 60-80% without quality loss.
Caching & CDN
HTTP caching headers, service worker caching strategies (cache-first, network-first, stale-while-revalidate), CDN deployment with edge caching, asset fingerprinting for immutable caching.
Runtime Optimisation
React.memo for expensive components, useMemo/useCallback for heavy computations, virtualisation for long lists, debouncing/throttling for event handlers, Web Workers for background processing.
Business Impact of Fast Frontends
Performance optimisation drives revenue and retention
Higher Conversion Rates
+15% conversions
Fast sites convert better. A 0.1-second improvement in load time increases conversions by 8%. Sub-2-second loads keep users engaged and buying.
Improved SEO Rankings
+30% organic traffic
Google Core Web Vitals are ranking factors. Excellent scores boost your search visibility, drive organic traffic, and reduce acquisition costs.
Reduced Bounce Rate
-25% bounce rate
53% of mobile users abandon sites that take over 3 seconds to load. Fast initial renders keep users on your site and exploring your content.
Better User Experience
4.8/5 user satisfaction
Instant interactions feel magical. Fast page transitions, smooth animations, and responsive interfaces create delightful experiences that build loyalty.
Higher Conversion Rates
+15% conversions
Fast sites convert better. A 0.1-second improvement in load time increases conversions by 8%. Sub-2-second loads keep users engaged and buying.
Improved SEO Rankings
+30% organic traffic
Google Core Web Vitals are ranking factors. Excellent scores boost your search visibility, drive organic traffic, and reduce acquisition costs.
Reduced Bounce Rate
-25% bounce rate
53% of mobile users abandon sites that take over 3 seconds to load. Fast initial renders keep users on your site and exploring your content.
Better User Experience
4.8/5 user satisfaction
Instant interactions feel magical. Fast page transitions, smooth animations, and responsive interfaces create delightful experiences that build loyalty.
Related Services
Complementary expertise to maximise your frontend performance
Ready to eliminate your technical debt?
Transform unmaintainable legacy code into a clean, modern codebase that your team can confidently build upon.