A method begins by obtaining scoring information for a rebuilding for one or more storage units of a set of storage units of the DSN. The method continues by determining based on the scoring information that a first input/output rate of a plurality of input/output rates for a first rebuilding rate of a plurality of rebuilding rates exceeds a difference threshold compared to an initial first input/output rate for the first rebuilding rate. The method continues by adjusting a plurality of initial input/output rates based on the first input/output rate to produce a plurality of updated input/output rates. The method continues by generating an updated plurality of scores for the plurality of rebuilding rates based on the plurality of updated IO rates and implementing the rebuilding in accordance with the updated plurality of scores.