Content Delivery Networks (CDNs) cache static content on globally distributed edge servers and route users to the nearest node, cutting latency, easing origin load, and speeding pages for better UX and conversions. They add DDoS/SSL security and scale with traffic; ideal for global e-commerce. Choose by coverage, caching strength, security, and scalability, then monitor and optimize for sustained performance.
Deferring non-critical JavaScript code with the `defer` attribute optimizes page load times and improves user experience by allowing browsers to render pages without waiting for scripts to load, reducing delays and improving engagement.
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