I will try to explain the situation in a short manner.
I have Filemaker Pro Advanced 16.03.302 for MAC running El Capitan 10.11.6 32 GB Ram with 4 GHz Intel Core i7 and 4GB Video Card. Love all the new programming features. But it is unusable in Layout Mode. Once in Layout Mode every step or task I do causes 10 seconds of the spinning beach ball. Moving a graphic, beach ball, checking a box off beach ball, formatting the fields the beach ball. I think you understand. Every single action in Layout Mode causes a 10 second beach ball. It doesn't matter if I access local files or files running on a Filemaker Server 14. It becomes so unusable I switch back to you using Filemaker 13 Pro Advanced and every is fast and no more beach ball.
Would like an explanation as to why the latest version of Filemaker Pro Advanced does not work well while Filemaker 13 Pro Advanced does.