The internet is faster than ever, but so are the expectations. Users expect instant interactions, and search engines actively reward speed. Yet, too many performance guides recycle outdated advice or focus on micro-optimizations that barely move the needle.
After auditing hundreds of production sites, our team at #about has identified the optimizations that consistently deliver measurable improvements. Here are 10 web performance tips that actually matter in 2025.
1. Core Web Vitals Aren't Optional Anymore
Google moved Core Web Vitals from "nice-to-have" to ranking factor years ago, but many teams still treat them as afterthoughts. The three metrics that define user experience are:
- Largest Contentful Paint (LCP): How fast the main content loads
- Interaction to Next Paint (INP): How responsive your site feels during interaction
- Cumulative Layout Shift (CLS): How stable the layout remains
Instead of guessing, implement Real User Monitoring (RUM). Synthetic tests show potential performance, but RUM shows what actual users experience across devices and networks.
Set performance budgets: LCP < 2.5s, INP < 200ms, CLS < 0.1. Treat breaches like bugs, not warnings.
2. Defer or Async Your JavaScript
By default, `