The benefit of Joerg's TrueIDE is that it reliably switches the CF card into IDE mode and it probably also patches the identify data so that the Amiga does not think it is a CD drive or something else it does not support.
I doubt that there is any benefit speedwise. The description does not say that it checks and possibly corrects every IDE command and response. It only speaks of the removable / fixed flag which is transferred during identification. All other traffic is just passed through.
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