Server-side performance refers to actions such as downloading a page of products (10 products), or processing an order. Issues which can affect the speed of such actions include:
The speed of your internet connection
The speed of your server, ie: processing power, RAM, server load etc
Now, use the POS to see if there is a performance increase
If there is a performance increase: reactivate your theme and plugins one-by-one to see which plugin is impacting your performance
If there is no performance increase: you may want to move to a better web host or invest in a faster internet connection
An example of products being stored locally
IndexedDB data persists even when you close the browser or restart your computer. If you notice that your product data is out of sync for any reason, you can clear the local storage and fetch a fresh set of data from the server.