The ProdFix Blog

Bad form validation UX causes rage clicks and abandonment. These are the patterns that frustrate users most.

Dark mode implementations break in specific browser and OS combinations. Here's how to monitor and fix them.

Web Components have browser compatibility issues that only surface in production. Here's what to watch for.

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.

The complete security checklist for SaaS products in 2025. 20 items every solo founder needs to verify.

JWTs are widely misimplemented. Here's every security mistake to avoid and the production-safe patterns.

React prevents most XSS but not all. Here's what still trips up developers and how to monitor for it.

Securing your API doesn't require a security team. Here's the essential guide for solo founders.

Your npm dependencies are attack surfaces. Here's how to audit and monitor them continuously.

CSP is the most powerful XSS protection available. Here's how to implement it without breaking your app.