Hello, there are different approaches to performance improvement on websites. Some focus solely on JS optimization, while others prioritize CSS and images. Which do you think is more effective? What are the critical steps? Could you share your experiences on prioritization? I'm looking for concept-based suggestions, not specific tools.
What's the best way to optimize site performance?
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That’s true—it often comes down to priorities: in quick fixes, optimizing images and CSS visibly reduces load times without touching JS. But once that’s done, JS becomes the real bottleneck, especially with dynamic pages.
Performance optimization is a topic that confuses all of us. Actually, you need to start from the very beginning: site performance isn't just about fast loading—it directly impacts user experience. Whether it's an e-commerce site or a blog, how long users stay on the site, conversion rates, and SEO rankings all play a major role. So, optimization should really be seen as part of user satisfaction and business goals.
When prioritizing, it usually makes sense to start with the big three: render-blocking resources, image optimizations, and network requests. JavaScript and CSS blocking the render process create a serious bottleneck. Here’s the key: first, you can defer or load non-critical CSS and JS asynchronously. Then, optimizing image sizes and using modern formats like WebP or AVIF can give you a 30–40% speed boost. For network requests, lazy loading and using a CDN are game-changers. Most importantly, keep measuring and improving—don’t just rely on lab reports. Focus on real user data (RUM). Every site is different, so without A/B testing, you shouldn’t assume anything is the "best" solution.
First off, I started by optimizing images since users notice those first. Compressing them to smaller sizes and converting them to WebP format helped, and then cleaning up unnecessary code in the JS and CSS files made a difference—especially with ads and tracking scripts. The biggest boost on my site came after optimizing the CSS media queries.