Okay... so cheats for other games work for you, I will assume?
Have you pulled the most 'recent' update via GeckoOS when playing a game? I'm assuming you should have had most if not all updates by now.
Anyway... try this attachment and see if it works. Sometimes games don't like combinations of codes.
https://dl.dropboxusercontent.com/u/71112228/SOUE01.gctThis is promising! Gecko OS 1.9.3.1 loaded the GCT file you shared, and the game ran without freezing. I don't know what was in the GCT file, but here is some more feedback: The text speed remained default, and after blowing myself up with several bombs (I'm in the mining village from my 2012 save file) the 3 heart warning beeped and the navi-like girl spoke a nonsense notification.
I may have thanked you with the button, but after seeing the beauty of this game I wanted to say it again. Thank you for helping bring my favorite RPG back. The text speed and bug notifications are most important to making it great for me.