These 4 simple steps will Speed Up your Joomla website
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When you Enabled Cache, a cache stores all or part of a web page so that it doesn't have to be pulled again and again from the database. By not needing to connect to the database, a website can respond much more quickly to a visitor.
Go to System > Global Configuration > System tab > Cache Settings > System Cache and select "ON - Conservative Caching"
Conservative caching: This allows a site administrator to choose which modules are cached. You can login to each module and enable for them individually. Conservative caching is better for frequently updated sites - you can remove caching from your modules that contain dynamic content.
Progressive caching: This takes a snapshot of each unique set of modules on a page, so many modules can be cached at once. This affects all modules and overrides any cache settings inside individual modules. Progressive caching is better for sites that don't update very often.
If you enable the internal Joomla! compressions system, the page that your visitors will browse will be compressed before it is transferred to them. When your webpage size is reduced through compression, it will load much faster.
Go to System > Global Configuration > Server > Server Settings", find the option "GZIP Page Compression" then enable it by clicking "Yes".
If you enabled this Page cache the your web page will be cached in the browser and the server doesn’t have to call the page files over and over again during the browsing period. This will make your site load faster.
Go to Extensions > Plugins and search “cache” in the search filter. The “System - Page Cache” plugin will appear, click the title to open.
Select "Yes" at Use Browser Caching. Enabled the plugin at Status.
JCH Optimize automates certain actions like combining CSS and JavaScript files, and this make the site speed up.
Go to Extensions > Plugins and search for "jch". Click the red cross icon to enabled.
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