One of my carryover notes for one of my clients has a detailed list of proforma'd things that should be deleted (prior-year IDCs from pass-throughs because I calculate excess IDCs at the entity level, state source passive carryovers for AMT because none of the states involved have a state-level AMT), which things shouldn't be deleted (state-source passive carryovers for regular tax), and how to get the amounts to key back in when you delete the wrong thing.

I find the automatic error checking (those little red !s in the Detail screens) slows my computer way down, but I've never noticed a significant lag due to auto-save.