Edwin, the choppy graphics complaints we’ve seen are almost entirely from users who are on machines below our minimum spec (ie, 2011 era non graphics card laptops). What you described is a freeze from time to time, which may be due to something that changed in networking code and would possibly be sensitive to internet lag. Before we release updates we test on many dozens of machines to verify it works well, but supporting hundreds or thousands of different machine combinations all on various levels of internet connection means that sometimes we’ll release something that some users will have an issue with. In those cases we’ll try our best to resolve.
Hugh, try running the app again. Usually after a fresh app install iOS kicks an app entirely out of the app cache, and it has to load from scratch. On the minimum spec iPads we support (ie, a mini 2) sometimes it will take ~20 seconds to load from scratch - and at 20 seconds iOS kills our app. If you run a 2nd time, most of the app will be in the cache and it will load in closer to 10 seconds, and be ready to go. Can you give that a try?