This content originally appeared on DEV Community and was authored by shubham khatik
🚀 Frontend Performance & React Tips Every Developer Should Know 🚀
Ever wondered what really happens when you hit a URL in your browser? It’s a fascinating journey through DNS lookup, HTTP requests, and the Critical Rendering Path (CRP)—the secret sauce that transforms code into pixels on your screen. Optimizing the CRP means faster load times and happier users!
⚡️ Quick Rundown on Key Frontend Concepts:
Repaint vs. Reflow:
Repaint updates visual styles (color, visibility) and costs less;
Reflow recalculates layouts (size, position) and is more expensive.
Canceling Old API Calls:
Use AbortController to cancel outdated fetch requests so your app only processes the latest data and stays performant.
Parallel API Calls:
Use Promise.all() when all API calls must succeed, as it fails fast on the first rejection. Use Promise.allSettled() when you need to run all calls in parallel and handle both successes and failures individually.
Frontend #WebDevelopment #ReactJS #JavaScript #Performance #WebPerf #CodingTips
This content originally appeared on DEV Community and was authored by shubham khatik
shubham khatik | Sciencx (2025-08-06T10:59:11+00:00) JavaScript Question Part 2. Retrieved from https://www.scien.cx/2025/08/06/javascript-question-part-2/
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