Your client is a business with 65,000 products. Even though a small fraction actually have demand, most are flagged as eligible for supply planning. The supply plan considers items with demand from production, sales, or a forecast (i.e., Supply Planned Items = "demand plan items, wip components, and all sales orders"). But a planner noticed that this ignored items whose only purpose is to be a substitute for important components. So the planner changed the plan scope to include "all planned items." This solved the problem of the substitutes, but the planner is complaining to you that their plan now takes a very long time to execute.

What is your recommendation to address their complaint?