How to Fix Core Web Vitals Issues in Joomla (Step-by-Step Guide)

Go to:
System → Global Configuration → System
Set:

• Cache Handler: File
• Cache Time: 15–30 minutes
• Platform-Specific Caching: Enabled

Caching reduces server processing and improves LCP.

Images are the most common reason for poor Core Web Vitals.

Best practices:

• Use WebP image format
• Compress images before uploading
• Resize images to actual display size
• Avoid lazy-loading above-the-fold images

Your main visual content should load immediately.

Templates have a major impact on Core Web Vitals.

Checklist:

• Remove unused CSS and JavaScript
• Avoid heavy sliders and animations
• Disable unused template features
• Keep template framework lightweight

A clean template improves LCP and INP significantly.

Enable:

• CSS minification
• JavaScript minification
• File combination where supported

Always test after enabling optimizations to avoid layout or script issues.

INP issues are often caused by:

• Excessive frontend JavaScript
• Tracking scripts
• Third-party integrations

Solutions:

• Load non-critical scripts after page load
• Remove unused extensions
• Avoid unnecessary frontend effects

Less JavaScript means faster user interaction.

CLS issues usually come from:

• Images without defined dimensions
• Fonts loading late
• Dynamic content pushing layout

Fixes:

• Define width and height for images
• Reserve space for banners or modules
• Preload fonts or use system fonts
• Avoid injecting content above the fold

Go to:
Global Configuration → Server

Enable:

• GZIP Page Compression

This reduces file size and improves load speed.

Go to:
Global Configuration → Server

Enable:

• GZIP Page Compression

This reduces file size and improves load speed.