WordPress acceleration through a synchronized cache
Speed Kit is a WordPress performance solution designed for users of the Plesk hosting platform in combination with the Plesk Speed Kit extension. The WordPress plugin is also available to WordPress users who already purchased a Speed Kit license. New subscriptions via WordPress are not possible anymore, so the licensing context is important before installation.
After activation, Speed Kit adds a Service Worker to WordPress. The Service Worker is accessible from /speed-kit-sw.js and reroutes requests from the WordPress backend to a fast cache synchronized with the website. This approach accelerates delivery from the user side without requiring changes to backend servers.
How the delivery layer works
Speed Kit is positioned as a layer on top of a site’s existing system, CDNs, and load balancers. It handles content synchronization and distribution to edge locations, while its caching technology is designed for dynamic data such as search and personalization. The source also describes automatic handling of network protocols and tailored images.
Because the plugin hooks into traffic rather than requiring backend, network, or frontend re-engineering, it can be used as a performance layer for an existing WordPress setup. The goal is to serve pages through the synchronized cache while the website remains connected to its WordPress backend.
Practical performance uses
Speed Kit is intended for sites where page delivery, user experience, search visibility, time on site, conversion activity, and bounce rate are important considerations. The stated benefits include turning page speed into a competitive advantage, supporting a speed-based search ranking boost, encouraging visitors to stay longer, growing e-commerce revenue and funnel metrics, and reducing marketing costs through lower bounce rates.
The source reports that Speed Kit powers about 7,000 websites, serves 200 million users monthly, has accelerated 3.6 billion euros of annual revenue, and scales 25,000 requests per second. These figures describe the service’s reported usage and capacity.
Trial and continuation
The source describes a first 10-day trial with no bank details required. After the trial, continued use is stated as 9.99 € per month. If no action is taken after the trial, Speed Kit stops handling requests and they are executed by the backend again. The site remains online during that transition.
Installation and measurement
Confirm that the site uses Plesk together with the Plesk Speed Kit extension and that an existing Speed Kit license is available. Install and activate the WordPress plugin, then allow the Service Worker and cache layer to handle requests. After activation, the Service Worker is available at /speed-kit-sw.js.
To assess performance uplift, the source recommends running a test with its Page Speed Analyzer or with WebPageTest. Enter the site address in the selected testing tool and compare the resulting performance information.
