Liferay - How to increase liferay performance?

In portal-ext.properties file add following entries.

# Turn off Liferay features not used
com.liferay.portal.servlet.filters.gzip.GZipFilter=false
com.liferay.portal.servlet.filters.strip.StripFilter=false
com.liferay.portal.servlet.filters.sso.cas.CASFilter=false
com.liferay.portal.servlet.filters.sso.ntlm.NtlmFilter=false
com.liferay.portal.servlet.filters.sso.opensso.OpenSSOFilter=false
com.liferay.portal.sharepoint.SharepointFilter=false
com.liferay.portal.servlet.filters.validhtml.ValidHtmlFilter=false
session.tracker.memory.enabled=false
counter.increment=2000
portlet.css.enabled=false

#
# Set the following to true to check last modified date on server side CSS
# and JavaScript.
#
last.modified.check=false

#
# Set this property to true to load the theme's merged CSS files for faster
# loading for production. Set this property to false for easier debugging
# for development. You can also disable fast loading by setting the URL
# parameter "css_fast_load" to "0".
#
theme.css.fast.load=true

#
# Set this property to true to load the combined JavaScript files from the
# property "javascript.files" into one compacted file for faster loading for
# production. Set this property to false for easier debugging for
# development. You can also disable fast loading by setting the URL
# parameter "js_fast_load" to "0".
#
javascript.fast.load=true