There is always a very big issue with joomla and other CMS's that the site became heavy and takes so much time to open .There are several ways of site speeding some of them are

1- Joomla Inbuilt provides the feature of GZIP compression  go to Global configuration->Server ->

    GZIP Page Compression amd chek yes to the radio button 

2 - The concept behind the site speeding is how many HTTP request is passing to the web server if the

     HTTP request is less ,then site takes less time to open and id HTTP request is high then it takes more  

     time,every object of your site like js(java script) file CSS file,images and media takes individual HTTP

     request 

3-  To reduce the http request we use sevral scripting like XSSI .by using XSSI we can reduce the http 

     request the detailed concept is here.

4-  write the compact code caz white spaces also the big hurdels here is the link by which you can reduce

     the size of your js and css files .link 

     contd......

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