Speedup Your Magento Site

its possible to make your magento site fast by following steps below

1. first  we need to update .htaccess file on root. this code below activate Gzip compression.

## http://developer.yahoo.com/performance/rules.html#gzip
    
    # Insert filter
    SetOutputFilter DEFLATE
    
    # Netscape 4.x has some problems_
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    
    # Netscape 4.06-4.08 have some more problems
    BrowserMatch ^Mozilla/4.0[678] no-gzip
    
    # MSIE masquerades as Netscape, but it is fine
    BrowserMatch bMSIE !no-gzip !gzip-only-text/html
    # Don’t compress images
    SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-vary
    
    # Make sure proxies don’t deliver the wrong content
    Header append Vary User-Agent env=!dont-vary
    
    # enable resulting html compression
    php_flag zlib.output_compression on

2. secoundly we need to save all products and category as 'FLAT RESOURCE'

    a. go to system->configration->catalog->frontend
    b. Use Flat Catalog Category, Use Flat Catalog Product you will see these 2 option at the end, Select Both to Yes.
    c. reindex all data from Index Management.