I want to improve page load speed and overall performance in my projects. I'm familiar with techniques like HTTP/2, lazy loading, and image optimization, but I'm unsure where to start when implementing them. Which methods provide the most benefit first? What reliable tools should I use for measurements? Also, what common mistakes should I avoid during these optimizations? What are your approaches to this?
How to improve performance in a frontend project?
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I ran into this exact problem last year when I was optimizing a React dashboard that loaded 500+ product cards with high-res images. First thing I did was run Lighthouse—turns out my First Contentful Paint was 3.2s because I was bundling all the images at once. Switched to Next.js Image with proper `sizes` and `priority` props, cut it down to 1.4s. The biggest “aha”? Lossless compression saved me 40% bandwidth but didn’t do a thing until I actually cached the optimized images on Cloudflare.
For tools, stick with Lighthouse and WebPageTest for visual regression, then use React-Profiler to spot unnecessary re-renders. Most devs forget to check Cumulative Layout Shift caused by hero images without aspect ratios—fixed it by adding `<Image layout="fill" />` and suddenly the page went from “good” 95 to 99. Oh, and one classic mistake: preloading fonts with `rel=preload` but not using `font-display: swap`, which still blocks rendering. Always check the waterfall in DevTools; it’ll scream when the blank page just hangs because CSS hasn’t arrived.