If enabled, your Gmail contact updates will be batched in groups of 100 when sent to Google. Doing so results in faster syncs. However, if you happen to have a problem with several of your Gmail contacts not getting updated, you can turn off "Batch Gmail Updates" as it may help you identify the problematic contact. Please email support for more information.
Sync Country Codes
If enabled, country codes will be synced with all of the other postal address data.