Performance Optimization

Performance Optimization in CodeIgniter (CodeIgniter 4)

Optimizing performance ensures your CodeIgniter application is fast, scalable, and efficient. Below are practical and proven techniques you should apply.

1. Environment Configuration

Set production mode:

CI_ENVIRONMENT = production

Benefits:

• Disables debug toolbar

• Reduces memory usage

• Improves response time

2. Enable Caching

Page Caching

$routes->get('home', 'Home::index', ['cache' => 60]);

Caches output for 60 seconds.

Query Caching

$cache = \Config\Services::cache();
$cache->save('users', $users, 300);

Retrieve:

$users = $cache->get('users');

3. Use Efficient Database Queries

✅ Use Query Builder
✅ Select only required columns

$model->select('id, name')->findAll();

Avoid:

• SELECT *

• N+1 query problems

4. Database Indexing

Add indexes to:

• Primary keys

• Foreign keys

• Frequently searched columns

Example:

CREATE INDEX idx_email ON users(email);

5. Optimize Autoloading

In:

app/Config/Autoload.php

Only autoload:

• Necessary helpers

• Required libraries

❌ Avoid loading everything globally

6. Use View Layouts & Partial Caching

Cache partial views:

<?= cache('sidebar', 300, function() {
    return view('partials/sidebar');
}) ?>

7. Minimize Middleware & Filters

• Apply filters only where needed

• Avoid heavy logic in filters

8. Optimize Assets (CSS/JS)

• Minify CSS & JS

• Combine files

• Use CDN for static assets

• Enable browser caching

9. Use OPcache (PHP)

Enable in php.ini:

opcache.enable=1

Significant performance improvement.

10. Disable Unused Features

• Debug toolbar (production)

• Unused routes

• Auto-routing

11. HTTP Response Optimization

• Use gzip compression

• Enable HTTP/2

• Set cache headers

12. Use Queues for Heavy Tasks

Offload tasks:

• Emails

• File processing

• Reports

Use:

• Cron jobs

• Message queues (Redis, RabbitMQ)

13. Monitor & Profile

Tools:

• CodeIgniter Debug Toolbar (dev)

• Xdebug

• Blackfire

• New Relic

14. Best Practices Checklist

✔ Production environment
✔ Caching enabled
✔ Optimized queries
✔ Indexed database
✔ Minified assets
✔ OPcache enabled

Summary

• Performance optimization is multi-layered

• Caching + DB optimization give biggest gains

• Production settings are critical

• Monitor continuously