The Zend Optimizer is a free application that runs the files encoded by the Zend Guard, while enhancing the performance of PHP applications, Zend Optimizer increases runtime performance up to 40%

More about Zend Optimizer: http://www.zend.com/products/zend_optimizer

Installation

Zend Optimizer Installation is easy and it takes less than 5 minutes!

1. Login to SSH into your server as 'root' user
   
   
   • Make a backup of your php.ini before you proceed:
     cp /etc/php.ini /etc/php.ini.backup
     
     
   • Download the file to your server
     wget http://downloads.zend.com/optimizer/3.0.1/ZendOptimizer-3.0.1- XXX.tar.gz
     
     Linux users should download "ZendOptimizer-3.0.1-linux-glibc21-i386.tar.gz",
     find your version here: http://downloads.zend.com/optimizer/3.0.1
     
     
   • tar zvfx ZendOptimizer-3.0.1-linux-glibc21-i386.tar.gz
     
     
   • cd ZendOptimizer-3.0.1-linux-glibc21-i386
     
     
   • ./install.sh
     
     
2. You will see Welcome Screen, just follow it.
   
   
3. When it's ready, ensure that Zend Optimizer is working:
   
   php -v
   
   You should see something like this for output:
   
   PHP 4.4.2 (built: Jan 1 2006 12:00:00)
   Copyright (c) 1997-2006 The PHP Group
   Zend Engine v1.3.0, Copyright (c) 1998-2006 Zend Technologies
   with Zend Optimizer v3.0.1, Copyright (c) 1998-2006, by Zend Technologies
   
   
4. After the installation is complete you can remove the directory.
   cd to where the extracted Zend first.
   rm -rf ZendOptimizer-3.0.1-linux-glibc21-i386
   
   

Congratulations,
you have installed Zend Optimizer!