WKInterfaceTable table performance

I have a WKInterfaceTable which is displaying too slow for my liking.


At a WWDC 2015 session, Jake Behrens suggests to load only the first few cells up-front, then the rest afterwards:

https://developer.apple.com/videos/play/wwdc2015-228/?time=1302


Is there sample code available for this? I've written code doing just this, but it's far less smooth than I'd like. The first few cells display fast, but UI is then frozen as others render. Different dispatch_async settings unfreeze the UI but display of the others takes a very. very long time.


Oh, how I miss iOS's reusable cells and lazy loading...