Website speed has been a highly discussed topic for years. Custom-built systems offer the best loading speeds but come at a high cost. Content management systems like Wordpress and e-commerce platforms such as Prestashop and Opencart perform worse, but with proper programming, they can also achieve decent performance. At a certain point, the size of CMS and e-commerce platforms becomes a burden, and it's necessary to switch to custom solutions or work more on website optimization and caching.
On standard shared web hosting, you can use APC for PHP 5.x and OPcache for PHP 7.x. We are now introducing the option to use Varnish Cache, running in a Docker container on high-performance SSD drives. Varnish Docker Cache is particularly suitable for Woocommerce and Prestashop.