What are the most impactful technical steps to prioritize when optimizing an e-commerce website's performance?

Question

Samer Allaham · Accepted Answer

The highest impact in performance optimization comes from pruning unnecessary JavaScript libraries and converting image assets to WebP format. These steps directly boost site speed, improve Core Web Vitals metrics, and protect conversion rates. Starting technical optimization with this 'code cleanup' to reduce browser overhead is the most rational strategy. Technical Priority Strategy for Performance OptimizationPerformance optimization in e-commerce is often mistaken for 'adding new tools.' However, true speed begins by shedding the unnecessary weight your site carries. Here are the fundamental steps to implement from an expert perspective:Pruning Unused JavaScript (JS) and CSS: Most e-commerce themes include dozens of libraries you never use. Identifying and removing unused JS files relieves the browser's main thread significantly.Image Optimization and WebP Conversion: High-resolution images can account for up to 70% of page weight. Converting all images to WebP format and enabling 'lazy loading' will drastically reduce your LCP (Largest Contentful Paint) times.Checkout Page Optimization: Streamline your checkout by removing unnecessary form fields and moving toward a 'One-Page Checkout' structure. Each additional field increases cognitive load on the user and can drag down conversion rates by 10-15%.Server and CDN Selection: If you are operating in a local market, optimized local infrastructures often provide more stable performance in terms of server speed compared to global alternatives.Implementation Tip: Do not focus solely on generic speed test scores; monitor Real User Monitoring (RUM) metrics to analyze how users behave during your site's slowest moments.