%USERPROFILE%\Documents\FIFA Manager 12\Config\user.ini
While the game plays at 60 frames-per-second in the normal manager interface, going into a 3D Match caps the frame rate at 30. There is currently no known fix.
To edit the game's database you have open EdManager12.exe that is in your install folder. Sometimes, even after exporting your custom database to the actual game, nothing will change. Be sure to run both programs (EdManager12.exe and Manager12.exe) with admin rights, and you'll be able to overwrite the game's database with your modifications.