“Expensive Components Without React.memo” is a medium performance issue that shows up in React projects. It is one of the 125+ checks NexusBro runs on every audit — the kind of problem that is easy to miss in code review yet cheap to fix once you know exactly what to look for.
Left unaddressed, it slows page loads, hurts Core Web Vitals, and wastes the crawl budget search engines give your site. The good news: this is a well-understood pattern with a deterministic check and a concrete fix, both of which are below. You can verify it by hand using the command shown, or let an automated scan find every instance of it across your whole site in one pass.
NexusBro checks for this automatically during a React audit. To verify it yourself, run the check below and apply the fix it describes:
Verify React.memo on expensive components: grep -rn 'React.memo\|memo(' src/ --include="*.tsx". List items, complex forms, and chart components should use memo to prevent unnecessary re-renders.Performance issues compound: each one adds milliseconds that push you below the threshold where users bounce and search engines down-rank. Because they are spread across many files, they are easy to overlook in review but straightforward to fix once a tool points to the exact spot.
NexusBro audits your whole site for this check and 120+ others across performance, SEO, accessibility, and security, then hands you a copy-paste fix prompt for your AI coding tool. Free for your first scan, no signup required.
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