Fast Sync for Gmail Contacts is a fast and simple way to sync Gmail & Mac contacts. Fast Sync for Gmail Contacts uses the newest multi-thread technology to sync contacts.
During the first synchronization, the contacts in Mac will be uploaded to Gmail, meanwhile the contacts in Gmail will be downloaded to Mac. When you add or modify contacts in your Mac, then sync again, these contacts will be added or modified in Gmail. For example, when you add a photo in a contact in your Mac, the photo will be sync to Gmail corresponding contact.