Zend Optimizer is a PHP addon which offers caching to improve speed when loading sites, it can increase performance by up to 40% by caching frequently viewed portions of PHP pages. Zend Encoder also is useful for encoding PHP files to protect source code. 

To install Zend Optimizer: 

1. Login to your server via SSH 

2. Run: 
/scripts/installzendopt 

3. Follow the instructions on the screen to install Zend Optimizer 

How to install Zend Optimizer on other than Cpanel?

Run this command 

 
cd /usr/local/src;wget http://downloads.zend.com/optimizer/3.2.8/ZendOptimizer-3.2.8-linux-glibc21-i386.tar.gz ; tar -xzvf Z* ; cd Zend* ; ./install 
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