Page Speed-Enable gzip compression

Add the following code to .htaccess(preferably in root)

 # compress text, HTML, JavaScript, CSS, and XML  
 AddOutputFilterByType DEFLATE text/plain  
 AddOutputFilterByType DEFLATE text/html  
 AddOutputFilterByType DEFLATE text/xml  
 AddOutputFilterByType DEFLATE text/css  
 AddOutputFilterByType DEFLATE text/javascript  
 AddOutputFilterByType DEFLATE application/xml  
 AddOutputFilterByType DEFLATE application/xhtml+xml  
 AddOutputFilterByType DEFLATE application/rss+xml  
 AddOutputFilterByType DEFLATE application/javascript  
 AddOutputFilterByType DEFLATE application/x-javascript  
 # remove browser bugs  
 BrowserMatch ^Mozilla/4 gzip-only-text/html  
 BrowserMatch ^Mozilla/4\.0[678] no-gzip  
 BrowserMatch \bMSIE !no-gzip !gzip-only-text/html  
 Header append Vary User-Agent