High Performance - Joomla!Days NL 2009 #jd09nl

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This document provides an overview of optimizing the performance of Joomla! websites. It discusses basic principles like using content delivery networks and combining files. It recommends preparing Joomla! with tools like Firebug and enabling caching. Specific optimizations for templates and content are covered, like image resizing and subdomain delivery. Hosting configuration tips include MySQL optimization and using a CDN. The document uses a case study example and concludes with thanks.

High Perfomance
a guide for optimizing the performance
of Joomla! websites

by Fotis Evangelou (JoomlaWorks)
www.joomlaworks.gr

Joomla!Days Netherlands - 12 & 13 June 2009

What's covered in this session

• Basic principles of web content delivery
• Prepare Joomla! for prime time
• Optimize our template and our content
• Configure hosting

www.joomlaworks.gr

Basic principles of web content delivery
The closer the server is to the user, the better
- DNS lookups (avoid redirects)
- The concept of the CDN (Content Delivery Network)

Browsers use 2 HTTP connections per domain to
download content
- Increase website download time using subdomains/CDN
- Combine CSS files
- Combine Javascript files
- Combine layout images into sprites

All modern browsers accept compressed content sent
from the server
- Compress HTML, CSS and Javascript code

www.joomlaworks.gr

Prepare Joomla! for prime time
Prepare the tools for your work
- Install Firefox with Firebug, YSlow and Web Developer Toolbar

Global Configuration
- Enable Joomla!'s built-in cache mechanism
- Enable GZIP

Extensions
- Choose extensions that properly separate content from
layout/behaviour – disable their CSS/JS includes and call CSS/JS
code into your template where possible.
- Enable caching for modules

www.joomlaworks.gr

Optimize our template and our content

- Combine and compress - using Gzip - CSS/JS files
- Do not pack your JS code, feel free to minify
- Use one JS library/framework
- Initiate JS code into as little onload events as possible
- Put all your layout (non-content) images as background images in
your template's CSS file
- Combine all your layout non-repeating images into one big image
(sprite), use CSS positioning to display

www.joomlaworks.gr

Optimize our template and our content

- Resize/resample content images manually or use a plugin to do
that
- Understand when to use GIF, PNG or JPEG
- Enable debug in Joomla!, check the number of queries with
cache on and off. Identify slow queries in PHP code.
- Dynamically replace URLs to point to subdomains/CDN
(make site.com/images/ show up as images.site.com)

www.joomlaworks.gr

Configure hosting

- Optimize MySQL depending on your needs and taget audience
- Use a CDN for image, CSS, JS and other static content delivery
- Split website load into 2 servers (if possible): one acts as web
server, the other as database server

www.joomlaworks.gr

Case study: gazzetta.gr

www.joomlaworks.gr

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