The premium speed plugin that we use represents an important part in all the work we do, although it is not the only thing we use. After a year, the license will expire unless it is renewed, so the plugin will no longer be updated, which will affect the speed of the site and for this reason we strongly recommend keeping it. The annual license has a very low quota compared to the work that the speed optimization system is doing. We consider this a very good investment, since the performance is essentially based on this plugin.