Good but needs fixing for iPod touch 3g

The game is fair and fun to play most of the time, however whenever a mist comes up it totally gets slow choppy and unresponsive. An example of this would be with the poison witch, or a number of the later bosses (sad village for example). Ive lost numerous heroes this way. Can this be fixed, or at least provide an option to turn this effect off? Running iOS 511, iPod touch 3rd generation.

TurboWesties about Deep Dungeons of Doom, v1.0.6