I have a customer who is running Dyn 2016 8.0 On-prem and Server Side Sync. One of the accounts has 12000+ appointments and when/if we do a “Test and Approve” of the mailbox it seems that the resync of the mailbox with the Exchange Server (ver 2010) takes a very long time, often over 12 hours.
(That was Gustaf “Surströmming” Westerlund asking for help, if you must know)
Joel to the rescue
Update said user’s sync filter for appointments to start date on or after 1-Sep-2017 or something like that. NO reason to sync old/completed appointments.
Be smart, be like Joel, and start using synchronization filters to exclude old or irrelevant data. That can definitely speed up both initial and ongoing synchronizations.
Another common scenario is when a user account is used to perform initial data import or integration, and that user ends up owning bazillions of contacts. Default synchronization filter is My Contacts which will attempt to drag all those records across into the user’s address book. Smart move would be to adjust the filter and exclude contacts from the initial synchronisation altogether and then, over the time, start bringing the relevant records in (once you figured out what does “relevant” mean to that poor user). You can use last contact date, for example.