Thank you for your post.
Some users have reported some performance issues with background images. If you remove the background image, is there a performance difference?
Is the dropdown field based on a value list or values from a table?
Are your layouts optimized for the iPad screen? You can find more information in the FileMaker Go Development Guide:
... and the FileMaker Go TechBrief:
If you are still having performance issues, feel free to send in your database file so I can better understand what you are doing and the performance issues you are encountering. Check your Inbox at the top of this page for instructions where to send your file.
I understand your frustration. Although I've never had FM Go crash on me as you've described, I have several issues with the App. However, I must admit that my own dissatisfaction with the product stems from my original expectation that FM Go would be just like having FMP on a mobile device, whether with files on the device (a PITA in terms of synching/importing) or by using my computer as a host server. Alas, none of this was to be. Developers are faced with the prospect of creating FM Go versions of their solutions . . . generally "stripped down" versions of their original solutions. One of the big issues I have with FM Go has to do with scripts and menus. On FMPA layouts can have different menus whose items call scripts. Scripts are stored per file. I generally do NOT allow scripts to appear in the Scripts Menu on Desktop solutions. However in FM Go a script is simply not available if the "Show in Menu" box is not checked. This unfortunately allows scripts (in FM Go) to potentially be launched out of context. I do go on . . . there's more but . . .