No, it won’t slow your site because it is not using the resources of your server rather it’s using the Zoom platform to render the meeting window. The load on your server will be similar to a normal page visit.
This is Adeel, the author of the popular LearnDash myCRED Integration addon and Adaptive Learning with LearnDash. Former BadgeOS contributor and Ninja at WooNinjas. I have been working as a web developer for the past 8 years now. I am passionate about applying the principles of progressive education to online learning and I believe e-learning should evolve according to the learning paradigm of the 21st century