Messages.app high CPU usage in Sierra

I think the problem referes to the new messages effects using iOS 10. My MacBook Pro switches to the discrete GPU when a message contains one of these new effects and uses the discrete GPU until i close the messages app manually.

I thought that might be the case, but I tried deleting all of my conversations and starting fresh, and still ran into the same problem even though all of the messages after that point were plain text.

Also, the 10.12.1 update yesterday did not fix the issue.

Looks like it is related to the fact that we are syncing Contacts from a Google account to the Mac (https://www.reddit.com/r/applehelp/comments/40lus7/messages_and_address_book_app _constantly_freezes/).

Apple, please advise since not being able to sync your Google account(s) Contacts to a Mac is unacceptable if you are using Google mail & contacts at your daily job.

Hi,

Apple will not comment here.

The Various Communities (Forums) are designed to be User to User based help.

There are Hosts (Moderators) who ensure the rules are obeyed and Community Specialists who are supposed to pick up on posts that have not had an answer in a certain time (it's about 24 hours in most Communities but can be one a Post drops off the Front page in fast moving ones)

The Contacts  issue is actually when you are using two or more accounts to sync.

See Contacts app > Preferences > Accounts

IF there are multiples in use then the App constantly cycles round and round each list to see if there are changes.

As it can never know when there are changes it will not stop.

One option as in the reddit thread is to Disable the choice to sync Contacts in System Preferences > Internet account (It can also be done in the Contacts Settings).

I have not tried it but you could also try setting the Check time in the Contacts app. "Automatic" seems to mean "Constantly"

9:26 pm      Wednesday; December 14, 2016