After 12 years of building WordPress sites, we finally admitted the truth: WordPress was killing our performance and our clients' conversions. Here's the transparent story of our migration to custom vanilla JS.

01 The WordPress Problem

WordPress is a fantastic CMS for non-technical users. But for high-traffic, performance-critical sites, it has fundamental architectural problems that no caching plugin can fix.

Our typical enterprise WordPress site had 47 plugins, a 4.2-second TTFB on uncached requests, and Core Web Vitals in the "Poor" range on mobile. The plugin update treadmill consumed 20+ hours per month of maintenance, and security vulnerabilities required constant vigilance.

"WordPress plugins are like credit cards: each one individually is fine, but add 47 of them and you're bankrupt."

02 Migration Strategy

Our migration followed a strict 8-week timeline with these phases:

  • Week 1-2: Audit existing site, map all URLs, document dynamic features.
  • Week 3-4: Build static HTML/CSS/JS templates with vanilla JS interactivity.
  • Week 5: Integrate headless CMS (we chose Sanity) for editorial workflow.
  • Week 6: Migrate all content, implement 301 redirects, set up CDN.
  • Week 7: Rebuild dynamic features (forms, search, e-commerce) as APIs.
  • Week 8: QA, performance testing, staged rollout, post-launch monitoring.
Pro Tip: Don't migrate everything at once. Use a strangler-fig pattern: migrate one section at a time, run in parallel with WordPress, and cut over section by section.

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03 Performance Results

The migration results exceeded our expectations. Every metric improved dramatically:

4.2s → 0.8s
TTFB Improvement
+42%
Conversion Rate
-60%
Maintenance Cost

04 Should You Migrate?

WordPress is not inherently bad. For non-technical teams that need a simple blog or brochure site, it remains a reasonable choice. But if any of these apply to you, migration is worth considering:

  • Your TTFB is over 1 second on uncached requests.
  • You have 20+ plugins, many of which conflict with each other.
  • Your Core Web Vitals are "Needs Improvement" or "Poor" on mobile.
  • Your maintenance budget exceeds $2,000/month for plugin updates and fixes.
  • You have a development team capable of maintaining a static site.
  • Speed is a competitive advantage in your industry.
Warning: Migration is not for everyone. If your team has no JavaScript expertise, the maintenance burden will simply shift from WordPress plugins to custom code. Be honest about your team's capabilities.

The honest truth: WordPress is the easy choice, not the best choice. For sites where performance matters, custom vanilla JS architecture is dramatically better. The migration is painful, but the payoff is permanent.