Web Performance: Fast, Responsive, Stable in 2025

Web Performance is one of those topics that’s constantly discussed as crucial for the modern web. It’s often framed as a key factor for user experience (UX), conversions, SEO, and overall success on the Internet. Every year kicks off with an article titled “New Challenges and Why Fast Websites Will Win in 20xx.”Yet when it comes to implementation, performance tasks in the backlog often don’t get the priority they deserve. This happens for two main reasons, two key questions arise:

1. Is it really that important? – Users aren’t complaining; everything loads quickly for me, too. Plus, our internal research hasn’t shown a clear correlation between performance metrics and search rankings. What even is a CLS of 0.4, and why should I care?
2. Is it worth the effort? – There are too many metrics; they’re confusing, and new ones keep popping up all the time. On top of that, the tools are complex and expensive. Wouldn’t it be better to invest resources in product features instead?

This guide-style article explores how to answer these questions in 2025 and how to build a balanced approach to web performance. As always, the balance is found between engineering decisions and business expectations

Source: Web Performance: Fast, Responsive, Stable in 2025 | Antony Belov