Hello!
After checking your site, I saw that most of the products on your site are external products (correct me if this is not the case). If so, then I have a question: how (manually or automatically), at what point (оn pageload or in the background at certain intervals) and how often the price of the products is updated?
The fact is that every time the price of a product is updated, the plugin makes an additional request to the database to check if there are any subscribers tracking the price of this product, and if there are any, then the plugin will check whether the price has been reduced to the level tracked by the subscriber, if this is true, then the plugin makes updates databases to queue a notification to a subscriber.
Thus, in order to answer your question, I need to know how the prices of products are updated. By the fact that this is the most likely moment that can provoke additional load on the server.
