Am folosit cu ceva vreme in urma:
Cod:
<IfModule deflate_module>
	<IfModule filter_module>
		AddOutputFilterByType DEFLATE text/plain text/html
		AddOutputFilterByType DEFLATE text/xml application/xml application/xhtml+xml application/xml-dtd
		AddOutputFilterByType DEFLATE application/rdf+xml application/rss+xml application/atom+xml image/svg+xml
		AddOutputFilterByType DEFLATE text/css text/javascript application/javascript application/x-javascript
		AddOutputFilterByType DEFLATE font/otf font/opentype application/font-otf application/x-font-otf
		AddOutputFilterByType DEFLATE font/ttf font/truetype application/font-ttf application/x-font-ttf
	</IfModule>
</IfModule>
Dar mai simplu poti instala un modul de cache.