How to site speed up through htaccess in magento

Enable Output Compression
This section will turn on the apache mod_deflate module, which compresses text, css, and javascript before it is sent to the browser. This results in a smaller download size. To enable, simply uncomment the appropriate lines so that it looks like the following:
<IfModule mod_deflate.c>

############################################
## enable apache served files compression
## http://developer.yahoo.com/performance/rules.html#gzip

    # Insert filter on all content
    SetOutputFilter DEFLATE
    # Insert filter on selected content types only
    AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript

    # 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

</IfModule>

Enable Expires Headers

    NOTE: This does not work on Litespeed servers.

Browsers use Expires headers to determine how long a page component can be cached. Static components, like images, should have far-future expires headers, but truthfully, all page components should have expires headers. To turn this feature on, just uncomment the appropriate line and add "ExpiresActive On" right above it. See below:

<IfModule mod_expires.c>

############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires

    ExpiresActive On
    ExpiresDefault "access plus 1 year"

</IfModule>

Disable ETags
ETags are a way for browsers to validate cached components across subsequent visits. They can slow down a site served from a cluster if the cluster hasn't implemented them properly. It is best to just turn them off as follows:



############################################
## If running in cluster environment, uncomment this
## http://developer.yahoo.com/performance/rules.html#etags

    FileETag none