I'm not surprised, sadly. I gave up on filemaker a while ago. I did a lot of fmp development ± 10 years ago. Then, for various reasons, I got into mysql and the 'LAMP stack' (as my real programmer friends say) and never looked back. That is, until last year, when I decided to get off my butt and build a point-of-sale app for my club. I thought, 'hey, I'll check out filemaker and see how it's progressed over the past decade...surely the odbc and general web support must have improved enormously...oh, look, they have an IOS app now!'
Well, the IOS app ran slower than molasses since they didn't use any of the webkit calls. In fact, aside from adding multiple tables to a DB years ago, as you point out, I can't see any real improvements in the last decade. Sad.
-waldo