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What breaks in WordPress, and how we fix it.

Step-by-step fixes for the WordPress and WooCommerce problems we see every week, and notes from real projects.

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14 posts, last updated Oct 7, 2026

Start with the problem you have.

The four we're asked about most

  • Site down or showing an error

    How to fix “There has been a critical error on this website”, step by step

    Errors & crashes7 steps9 min read

  • Hacked, or Google is warning visitors

    How to tell if your WordPress site is hacked, and what to do in the first ten minutes

    SecurityGuide8 min read

  • Slow for visitors or in the dashboard

    How to reduce TTFB in WordPress (measure first, then fix)

    Speed6 steps10 min read

  • Checkout or payments failing

    WooCommerce checkout not working: the 8 usual causes

    WooCommerce8 steps9 min read

All posts

14 posts, newest first

New

WooCommerce High-Performance Order Storage (HPOS): how to switch safely

Switch WooCommerce to High-Performance Order Storage safely: fix incompatible plugins, sync and verify orders, switch with sync on, and roll back if needed.

WooCommerce 9 steps 11 min read

The short answer

Fix or replace anything that is not HPOS-compatible first. Then turn on compatibility mode, let WooCommerce copy every order into its new tables, check the copy, and switch to High-performance order storage with sync still on. Keep sync on for about a week of real orders as your undo button, then turn it off.

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