4 Lazy Loading Mistakes I Fixed in My React App (and How You Can Too)

Lazy loading sounds like a no-brainer performance win, right?

But when I dug deeper while optimizing a Next.js app — I realized I was making it worse, not better.

Here are 4 mistakes I fixed that might save you a few hours (and some Core Web Vitals pain):

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🛑 1. Lazy-loading above-the-fold content
It broke LCP scores. Now, I load the hero section and nav eagerly.

🛑 2. Loading on scroll instead of intersection
Googlebot doesn’t scroll. Switching to IntersectionObserver fixed indexability.

🛑 3. Not reserving image space
CLS went wild. Defining image width and height solved it.

🛑 4. Overdoing React.lazy()
Split too many bundles. Now I lazy-load only modals and sidebar components.

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🔍 I’ve written the full breakdown with code examples and SEO-safe tips in this detailed blog:

👉 Avoid These Lazy Loading Mistakes That Could Slow Down Your Website (Medium)

Let me know if you’ve seen other issues — I’d love to learn from your experience too!

#performance #react #javascript #webdev #lazyloading #corewebvitals