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An article was posted recently on Joomla Extensions Directory which gives users a few useful tips: 8 Joomla tips to make your life easier. However I would like to elaborate on it a little, mainly on the Speed up your website section:

In some cases using Progressive Alternative PHP Cache with Joomla will do more harm than good. Progressive caching isn't generally recommended because it only offers a performance improvement if the same visitor visits the same page within the lifetime of the cached version of the page. In most scenarios, progressive caching results in a huge performance hit that is far worse than disabling cache, simply because for nearly every visit, Joomla has to process the request, create the cached version of the page, and then serve the page to the visitor (instead of just processing the request and serving the page in the scenario where cache is disabled). As for Alternative PHP Cache, it is a caching mechanism that runs on a lower level than Joomla – meaning that clearing Joomla’s cache will not really clear the cache, since that cache is technically handled by APC - in result if for example there are frequent changes made to the website, some of them could be lost in the process.

Using Gzip compression is generally safe to use and it can make your website a little bit faster, however you should know that there is an issue with default Joomla Gzip and Facebook robot, when it is enabled Facebook simply won't be able to scrape your site correctly, thus preventing OpenGraph tags from displaying when sharing content. As an alternative you can use other extensions which provide Gzip compression like JCH Optimize etc.

One more thing about Save javascript in Custom HTML modules section - you can save Javascript or Iframe tags with default TinyMCE editor too, here are the steps to do so:
  1. System -> Global Configuration -> Text Filters - set No Filtering for your user group.
  2. Extensions -> Plugin Manager -> Editor - TinyMCE - delete everything and add a period (,) in the Prohibited Elements field.

You can also use script and iframe tags in articles too, not only in custom html modules.

I hope you will find this information helpful, stay tuned for more articles which will try to expand your Joomla CMS knowledge.