I've always had 22 FPS - 25 FPS with the speedup patch, it's still the same speed as it's always been. Perhaps something else is affecting your performance, no difference in speed here. Even with EFB -> Ram it's fast and the game is no faster with EFB -> texture as you already mentioned.
Something I noticed when dumping the textures last night, it seems the minimap is constantly redrawn, I noticed hundreds of minmap textures that were dumped. It seems every change on the minimap causes it to be redrawn at several times a minute. Each minimap texture varied slightly, such as showing my different locations on the map as I moved throughout the game so it seems that it isn't just Hyrule Field, although Hyrule Field has the worst slowdown.
Something I noticed when dumping the textures last night, it seems the minimap is constantly redrawn, I noticed hundreds of minmap textures that were dumped. It seems every change on the minimap causes it to be redrawn at several times a minute. Each minimap texture varied slightly, such as showing my different locations on the map as I moved throughout the game so it seems that it isn't just Hyrule Field, although Hyrule Field has the worst slowdown.