🐞 Debug Slow Queries and Performance
Site slow? Query Monitor shows database queries, hooks, memory usage, page speed. Essential debugging plugin.
📝 What Query Monitor Shows
Install: Plugins → Add New → Query Monitor Dashboard shows: - Database Queries (count + time) - Page Generation Time - Memory Usage - Hook execution - HTTP API calls - PHP errors and warnings Database queries tab: - Full SQL queries - Query duration - Which component (plugin/theme) called it - Duplicate queries detection Hooks tab: - All action and filter hooks fired - Execution time per hook - Hooks called multiple times > 100 queries = slow page > 1 second DB time = slow page
🎯 Debugging Tips
- Identify slow queries (highlighted in red) - Find duplicate queries (same query repeated) - Check for N+1 queries (queries inside loops) - Monitor hook performance - Track plugin impact Common optimizations: 1. Cache frequent queries (transients) 2. Add indexes for slow queries 3. Remove unnecessary plugins 4. Optimize WP_Query parameters 5. Lazy load resources
💡 Pro Tips
- Use only in development (disable in production)
- Set user permissions for Query Monitor access
- Use with caching plugin for comparison
- Monitor third-party API calls
“Query Monitor found 50 duplicate queries on homepage. Fixed them, page load dropped from 4s to 1s. Essential debugging tool.”