Performance work often turns into a grab-bag of unrelated fixes. The teams that get real, lasting speed improvements usually start somewhere more specific: identifying which metric is actually hurting users and revenue.
Find the real bottleneck before optimizing anything
Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift each point to different problems, from render-blocking resources to unstable layouts. Measuring first prevents weeks of optimizing something that was never the actual issue.
The fixes that consistently move the needle
Image optimization and lazy loading, trimming unused JavaScript, and reducing third-party scripts tend to produce the biggest, most reliable wins. Micro-optimizations matter far less than removing the handful of heavy, unnecessary things a page is loading.
Speed work pays off fastest when it’s targeted at the metric that’s actually failing, rather than applied evenly across everything at once.
