What is mod_pagespeed ?

mod_pagespeed is an open-source Apache module that automatically optimizes web pages and resources on them. It does this by rewriting the resources using filters that implement web performance best practices. Webmasters and web developers can use mod_pagespeed to improve the performance of their web pages when serving content with the Apache HTTP Server.

mod_pagespeed includes several filter that optimize JavaScript, HTML and CSS stylesheets. It also includes filters for optimizing JPEG and PNG images. The filters are based on a set of best practices known to enhance web page performance. Webmasters who set up mod_pagespeed in addition to configuring proper caching and compression on their Apache distribution should expect to see an improvement in the loading time of the pages on their websites.

How to install mod_pagespeed?

First,  check which Linux distribution you are using by this command:

cloudtech ~: uname -a
Linux cloudtech #1 SMP Tue Nov 10 16:29:17 UTC 2009 x86_64 x86_64 x86_64 GNU/Linux

Second, download the package at this link: mod_pagespeed latest version

Here I am using 64 bits CentOS Linux system, so i ‘ve downloaded mod_pagespeed 64-bit .rpm (CentOS/Fedora)

wget https://dl-ssl.google.com/dl/linux/direct/mod-pagespeed-beta_current_x86_64.rpm

Third,  install the package

rpm -i mod-pagespeed-*.rpm

or follow the instruction in official site. If you cannot install it, try this:

Install and import Google key into RPM, then you can install mod_pagespeed package using yum localinstall command:

wget https://dl-ssl.google.com/linux/linux_signing_key.pub
rpm --import linux_signing_key.pub
yum localinstall mod-pagespeed-*.rpm

Check which files you just installed:

cloudtech ~: rpm -ql mod-pagespeed-beta

Last, restart Apache to load the new module

cloudtech ~: service httpd restart

How to upgrade mod_pagespeed?

Download the latest version and use command yum localinstall mod-pagespeed-*.rpm to install


With this release,  you can perform the upgrade to with these commands:
  sudo yum update
  sudo /etc/init.d/httpd restart
On Debian or Ubuntu installation you can use:
  sudo apt-get upgrade mod-pagespeed-beta
  sudo /etc/init.d/apache2 restart

How to test mod_pagespeed?

Visit your site without mod_pagespeed


Visit your site with mod_pagespeed


Without mod_pagespeed, my site score is 73/100.

With mod_pagespeed, my site score is 81/100.

Monitor the results using Firebug + Pagespeed on your Firefox browser

You can also test your site at ModPageSpeed.com

By default, Chinese characters do not work in WordPress if you didn’t originally setup your WordPress to handle it. To display or compose Chinese in your blog, you can change the WordPress database Collations to utf8_unicode_ci for all tables. If you have phpMyAdmin, you can manually change them one by one. However, it will take long time to fix all of them. Here is an easy way to change all Collations using script.

1. Create a file as: alter_mysql_tables.php

2. Copy and paste the following lines to the file and modify it using your own database connection

Download File: [download id=”1″]
3. Save the file and upload to your ftp.
4. Run the script in browser: http://www.yourdomain.com/alter_mysql_tables.php
5. That’s all!

By default, WordPress uses URL with question mark and its post ID.  After enable Pretty Permalinks, all the posts give 404 error. At first, I thought it’s .htaccess problem, however this file was updated automatically after applied the changes. After searching Wordpress documents, I found that it also requires FollowSymLinks option and AllowOverride FileInfo directives in Apache configuration file. I never knew this since shared hosting server has those options enabled by default. On VPS server, I have to configure by myself.

vi /etc/httpd/conf/httpd.conf

# Each directory to which Apache has access can be configured with respect
# to which services and features are allowed and/or disabled in that
# directory (and its subdirectories).
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Test environment : cPanel 11.25.0-R46156 – WHM 11.25.0 – X 3.9
CentOS 5.5 i686

1. cd /usr/src/

2. Download ffmpeginstaller 3  series Latest Stable Release at here

wget http://mirror.ffmpeginstaller.com/old/scripts/ffmpeg3/ffmpeginstall.3.2.1.tar.gz

Note:  ffmpeginstaller 3 scripts will install stable versions of all binaries. ffmpeginstaller version 4 will install all latest dependencies of ffmpeg and mplayer, and  also use svn  version of ffmpeg and mplayer. Version 4 and 5 may cause problem on your VPS. I recommend you install Version 3.Continue reading