Website Speed Optimization Guide 2026: Core Web Vitals for India
By Rahul Kumar · · 14 min read
Google uses Core Web Vitals as a direct ranking factor. Indian websites face additional challenges — users on 4G connections with mid-range smartphones account for 78% of Indian web traffic. Optimizing for Indian users means optimizing for performance-constrained devices.
The Three Core Web Vitals
- LCP (Largest Contentful Paint): Measures loading performance. Target: <2.5 seconds. Caused by unoptimized images, render-blocking resources, slow server response.
- INP (Interaction to Next Paint): Measures responsiveness. Target: <200ms. Caused by heavy JavaScript execution on the main thread.
- CLS (Cumulative Layout Shift): Measures visual stability. Target: <0.1. Caused by images without dimensions, late-loading fonts, dynamic content insertion.
Image Optimization: The Biggest Win
Images typically account for 60–80% of a webpage's total file size. Converting images to WebP or AVIF format and compressing them reduces LCP times dramatically. Use DigiNow's image compressor to convert and compress all website images before upload.
Quick Wins Checklist
- Add width and height attributes to all img tags to prevent CLS
- Add loading="lazy" to below-the-fold images
- Use a CDN (Cloudflare free tier) for static assets
- Enable Brotli compression on your server
- Defer non-critical JavaScript with async/defer attributes