.htaccess for performance optimization in Magento. It will not sky rocket your website, but will show notable improvement. The default Magento .htaccess comes with performance optimization, but commented by default. I will show you here which lines to uncomment and improve the performance.
Compressing web pages with mod_deflate
The mod_deflate module allows the Apache2 web service to compress files and deliver them to browser that can handle them. With mod_deflate you can compress HTML, text or XML files by upto 70% of their original sizes! Thus, saving you server traffic and speeding up page loads.
Check your .htaccess file for below code, I have removed hashes before few lines to uncomment them for performance.
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<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
# 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>
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Enabling expires header with mod_expires
Make browser cache static files with Apache2′s mod_expires module.
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<IfModule mod_expires.c>
############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires
ExpiresActive On
ExpiresDefault "access plus 1 year"
</IfModule>
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