The ProdFix Blog

Google's Core Web Vitals affect SEO and user experience. Here's what matters for solo founder SaaS — and what you can safely deprioritize.

Every second of load time costs you conversions. Here's the data on how page speed affects SaaS conversion rates — and the fixes with the highest ROI.

Rage clicks — when users frantically click the same element — are a goldmine of UX insight. Here's how to find them, interpret them, and fix the underlying issues.

LCP (Largest Contentful Paint) is the most important Core Web Vital. Here's how solo founders improve it in Next.js — practically, with high-ROI changes only.

Session replay lets you watch how real users interact with your app. Is the setup cost and privacy overhead worth it for a solo founder? An honest take.

Lighthouse and synthetic tests show you an idealized version of your app. Real User Monitoring shows you what real users actually experience. Here's why that matters.

TTFB is the foundation of every other performance metric. Here's the systematic guide to reducing it.

CLS above 0.1 costs you Google rankings. Here's every fix for the most common layout shift causes.

INP replaced FID in 2024 and many sites fail it. Here's how to measure and optimize INP for your SaaS.

Custom fonts are a common cause of poor LCP. Here's how to load fonts without hurting your performance score.

Tasks over 50ms block the main thread and tank your INP. Here's how to find and break up long tasks.

SSR is supposed to improve performance. Here's when it hurts instead and how to detect the difference in real users.

Slow database queries silently destroy your app's performance. Here's how to find and fix them without a DBA.

Slow API endpoints frustrate users before they can report them. Here's how to monitor and fix API latency.

React re-renders cause invisible performance degradation as your app grows. Here's how to detect and fix it.

Your Lighthouse score is 95. Your real users experience 65. Here's why they differ and which one to optimize for.

Loading skeletons improve perceived performance. Here's the data on whether they actually reduce bounce rates.

Resource hints are free performance wins. Here's how to use prefetch, preload, and preconnect correctly.

Lazy loading improves initial load but introduces errors. Here's the production-safe pattern.

CDNs don't always improve performance for every user. Here's how to measure real CDN impact.

Service workers can make your app feel instant. Here's the production-safe caching strategy.

Long lists destroy performance. React virtualization fixes it. Here's the production-safe implementation.

Images are the biggest LCP opportunity. Here's the complete 2025 optimization guide.

Tree shaking removes unused code. Here's how to ensure it works correctly in your production build.