Lag When Customer Selects Appointment Date/Time

On the public-facing pages where we have calendars embedded for customers to make appointments, there is a lag after selecting a service where unavailable dates and times are shown as available. These unavailable times are briefly allowed to be selected by the customer before the calendar refreshes to only show available dates and times. This has caused customers to book times which are already booked.

Is this an issue with the plugin or something with the website not loading properly? We already have ‘Make user choose service before display times’ set for all calendars.