So is this just something weird happening for me, or is it a problem for everyone at the minute. iCloud drive is taking a lifetime to sync document updates. It must be downloading and upload at about 0.1kbps! I've just tried using handoff to open some changes from my iPhone in numbers on the Mac and its spend 12 minutes attempting to open the document so far... Theres obviously something not right, I wondered if this was a global issue or literally just me at my place and if so, what on earth could be causing it?! I took about an hour for iCloud drive to sync the Pages/Numbers documents despite them being no more than about 3mb in total. I've tried changing my DNS from opendns to local ISP's local DNS in case that was an issue, but no change. Finally the document just mentioned has opened in numbers, a full 13 minutes after I clicked the icon in Finder to continue editing on the Mac. I'd suggest cache files on my Macbook etc, but my iPhone is behaving the same way. I rebooted my Airport Extreme base stations numerous times, so I can't think its that - mean while Dropbox continues to work flawlessly.