Not at all, performance is a top priority in WDesignKit.
We work on an Import/Export system, which means designs, templates, and widgets are only added to your site when you choose to import them. Nothing unnecessary runs in the background.
The plugin also follows a modular structure, so only the features you use are active. We continuously optimize performance and release updates for better speed, compatibility, and security.
For best results, we still recommend using good hosting and a caching/optimization setup, as overall speed depends on your full website environment.