PWA Performance That Achieves Sub-Second Loading on 3G Connections
Akamai found that every 100ms of latency costs 7% in conversions. Portent shows 1-second sites convert at 3x the rate of 5-second sites. We optimize PWA performance through service worker caching, code splitting, lazy loading, and CDN deployment to achieve sub-second Time to Interactive on mobile networks.
conversion loss per 100ms of additional latency, making PWA performance optimization directly tied to revenue through faster loading and cached repeat visits
Akamai, 2017
PWA Performance Optimization
What's Included
Everything you get with our PWA Performance Optimization
Caching Strategy Optimization
Service worker cache audit and optimization with precaching for critical assets, runtime caching with appropriate strategies per resource type, and cache size management
Bundle and Asset Optimization
Code splitting, tree shaking, lazy loading, image compression with WebP and AVIF, font subsetting, and critical CSS extraction to minimize initial payload
Core Web Vitals Tuning
LCP, FID, CLS, and TTFB optimization with Lighthouse auditing, real user monitoring, and specific fixes for each metric across mobile and desktop
Our PWA Performance Optimization Process
Performance Audit
We run Lighthouse audits, analyze Web Vitals from real user data, profile the service worker cache hit rate, and identify the specific bottlenecks causing slow loads. We prioritize fixes by conversion impact.
Caching Strategy Optimization
We audit the service worker caching configuration, optimize precache lists, tune runtime cache strategies per resource type, implement cache versioning, and add cache size limits to prevent storage bloat.
Bundle and Asset Optimization
We implement code splitting at route boundaries, configure tree shaking, convert images to WebP/AVIF, subset fonts, inline critical CSS, and lazy load below-the-fold content. Every byte is justified.
Monitoring and Verification
We set up real user monitoring for Core Web Vitals, configure performance budgets that alert on regressions, and verify improvements in Lighthouse and field data. We document the performance gains.
Key Benefits
Sub-second loading on mobile networks
Code splitting, lazy loading, and asset optimization reduce first-visit payloads to the minimum needed for the current page. Users on 3G connections see interactive content in under one second instead of staring at a loading spinner.
100ms repeat loads from service worker cache
Precached app shells and runtime-cached assets load from local storage on repeat visits. No network round-trip required. Users experience instant loading regardless of whether they are on Wi-Fi, cellular, or completely offline.
Core Web Vitals that pass Google's thresholds
LCP under 2.5 seconds, FID under 100ms, CLS under 0.1. Google uses Core Web Vitals as a ranking factor, and optimized PWAs pass all three thresholds. Better performance means better search rankings and more organic traffic.
Research & Evidence
Backed by industry research and proven results
Online Retail Performance
Every 100ms of latency costs 7% in conversions, and service worker caching eliminates network latency entirely on repeat visits
Akamai (2017)
Page Load and Conversion
A 1-second site converts at 3x the rate of a 5-second site, and PWA optimization techniques like app shell caching achieve sub-second loads even on slow networks
Portent (2022)
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