The latest version of Tweetbot for iOS has upgraded its iCloud syncing engine to CloudKit, bringing faster performance for timeline, DM, and mute filter sync. From the release notes:
This update is all about sync. We've switched our syncing engine to use CloudKit which will provide you with faster, more consistent syncing between your iOS devices and Macs. It also sets up a foundation for some cool features we have planned for future releases. We know improved syncing doesn't sound too exciting, but it will provide a better underlying experience.
From a user's perspective, nothing's changed – Tweetbot still uses iCloud and you don't have to change anything in your preferences. However, Tweetbot is now using a better version of iCloud, with near-instant sync of changes between devices.
I've been running this version of Tweetbot with CloudKit sync for a few weeks, and it's a very nice upgrade from the old iCloud sync. I've often left two devices running with Tweetbot in the foreground at the same time, and I've seen the timeline scroll on one device just a second after I stopped scrolling on the primary device. It's impressive.