I'm working on a webapp that incorporates a custom player using the new /player endpoints.

I'm wondering what your recommendations are for keeping track of the user's playback?

At the moment I've implemented a solution that works pretty well when the user stays and controls from my player, but will desynchronise if the user pauses or scrubs from the Spotify player, so I'm going to start polling the GET /player endpoint.

With regards to rate limits and general good practice, how often should I make a request to this endpoint? Every second would be ideal but with many users could that cause rate limit issues?