Well unlike platforms like WordPress, Magento, OpenCart, Shopify etc which offer you a bare-bones platform, CS-Cart is a full-featured eCommerce platform with lots of functionality and compatibility for customisation. To get this level of functionality in other platforms, you would need to bloat them with additional addons or plugins that will slow down the site or fill your site full of errors. Not only does CS-Cart come packed with functionality but it is really fast, with additional server-side and client-side optimisations like Gzip, Lazy Image Loading, Built-in cache and CDN support. You can customise your site then have it running lightning quick.