Does anyone have a problem with the Mail app in Mavericks constantly syncing?
There are two ways to check for this behavior:
1. In the bottom left "Mail Activity" box, it will increment up to something like "Incoming Messages...22 of 29" and stay at that exact count (whatever the numbers might be) for 5 to 10 minutes.
2. If you open the Window--->Activity window to watch the syncing process, you'll see that Mail is almost CONSTANTLY syncing your entire iCloud (non-local) folder structure. For anyone with 100s of folders, this pretty much means it spends 5-15 mins syncing ALL your folders, and restarts this process every 5 minutes after it finishes the last sync; consequently there is rarely a time when it's not busy syncing.
I have one Mac w/Mavericks and one w/out Mavericks, and they both access the exact same email accounts with the same amount of folders and messages. The Mac w/out Mavericks does NOT exhibit this behavior. It's running on Mountain Lion, is a 2007 Mac, and yet the Mail client behavior is FAR superior to the Mavericks client's constant syncing.
N.B.: I don't mind if Apple made a change to the client that dictates it is almost always syncing; I just need someone to corroborate that, and I'll then make adjustments by getting rid of my 2 current makes, moving to a single notebook, and moving most of my iCloud folders to the local machine so that they don't have to be synced to anything (giving up, of course, folder accessibility on my iPad and iPhone, but I can deal with that).
I should also add that I have something like 500 folders in the iCloud tree, and approximately 500,000 emails all told across all my accounts (the majority in my iCloud account).
If there is anyone else out there with a lot of emails, an oldster like me perhaps who started emailing in the early 90s and has ported everything into Apple Mail, it would be a HUGE help to me if you could open that Activity window and report your findings.
Thanks!