I spent a small fortune upgrading my A1200 with an Apollo 68060, only to realise that AGA was still as slow as ever in 256 colors dblscan, which is what ImageFX, Photogenics, Cinema 4D and Pagestream need as a minimum to be used comfortably
Sorry but you did it wrong.
If you had purchased a hardware flickerfixer then your gfx speed would have quadrupled.
You are never ever ever ever supposed to use dblscan modes. They are ridiculously slow.