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In the following topic I'll list all the prestashop performance tips I've got to know so far, and will add any tip that the prestashop community may suggest. Tip 1.- Activate CCC for CSS and JS in Advanced Parameters - Performance. Tip 2.- Enable Prestashop's Smarty Cache in Advanced Parameters - Performance. Tip 3.- Uninstall any unused module and, if you are using Google Analytics, uninstall also every prestashop stat module. Tip 4.- Adjust image sizes according to your theme's parameters. Tip 5.- Optimize image size by compressing them by using either a free service such as Smush-it or with a paid module such as Smush Optimize Image from PresTeamShop. Tip 6.- Activate a cache system on your server. Tip 7.- Use a module for HTML or MySQL cache. I personally use Joe Martin's Page Cache Module, but another great cache module is Xtendify's Express Cache. Tip 8.- Use either a great shared hosting service for Prestashop such as CloudWays, a VPS Server or a dedicated one depending on your customization and performance needs. Tip 9.- Use CSS Sprites for your static background images. Tip 10.- Move JavaScript files to the bottom by using El Patron's modules JavaPro for Front Office and BoZoom for Back Office. Tip 11.- Clear unused database tabs and entries, you can use RSI's Presta Speed module to achieve this. Tip 12.- Configure ETags according to your needs. You can disable them by adding to your .htaccess file "FileETag None Header unset ETag". Tip 13.- Activate GZip compression for Prestashop following these steps. Tip 14.- Use lazyload to reduce total HTTP requests for images and page's total size: Lazyload for Prestashop. Tip 15.- Minify all of your CSS and JS files if you won't edit them anymore (Keep a copy of these before doing it). Tip 16.- Eliminate all the unnecessary hooked modules from key hooks such as displayLeftColumn, displayRightColumn, displayHome, etc. Tip 17.- Reduce the number of CSS rules and files by using a consistent design throughout all your store.