If you mark less number of characteristics in 'to be changed', this will generally lead to less reference data being read (and processed) and hence, faster execution. But this tip is generally more relevant in Fox functions because while designing those, people tend to make mistakes which lead to poor performance.
Also see if you are having fields for conditions and can reduce them. They are also an overhead - remove any unnecessary conditions, for eg., those which will always be met or conditions which are same as the restriction used in the planning package.
Try filtering your planning level or Agg. Level to only the TO values. The from values need not be in the level. Clearly they will still be read but as reference data. Sometimes this speeds things up.
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