How to speed up force calculate step?

Ah, I see what you mean. I was going to suggest using a Data Management job, but it looks like it works in the same way you mention - i.e. when you use a filter on  a Force Calculate step, the resulting members are calculated sequentially.

The most efficient approach would probably be to just Consolidate parents instead, letting OneStream do what it does best (i.e. parallelizing dataunit calculation).

If that's not possible, depending on what you're doing in those calculations and how long they take individually, it *might* make sense to play around with .Net parallelization yourself, as shown in the example extender below. However, in my tests this adds significant overhead - although they are nominally started at the same time, having to set up internal machinery for each additional thread actually slows down the total execution time by several seconds per thread. If each calculation can take minutes, that's a price worth paying; otherwise, we're making things worse. It may or may not be faster to launch parallel Custom Calcs with ExecuteCustomCalculateBusinessRule instead of going through DataManagement, but at that point you cannot use regular Calculate. Also, it's completely possible that some stuff will work (or not work) in unexpected ways, as it's always the case when one plays with threads; in that case, maybe just launch the sequences one after the other in a simple loop, and hope that OneStream will parallelize some of them (and likely remove some of the threading overhead).

Case Is = ExtenderFunctionType.ExecuteDataMgmtBusinessRuleStep
	' define which dimension and parent to get base members for
	Dim myDimPk As DimPk = brapi.Finance.Dim.GetDim(si, _
							args.NameValuePairs("Dimension")).DimPk
	Dim parentId As Integer = brapi.Finance.Members.GetMemberId(si, 
									DimType.Entity.Id, _
									args.NameValuePairs("ParentEntity"))
	' retrieve base members
	Dim baseMembers As List(Of Member) = brapi.Finance.Members.GetBaseMembers(si, _
																myDimPk, _
																parentId)
	' set up parameters for our parallel jobs, 
	' in this case containing the name of the member we want to calc
	Dim paramDicts As New List(Of Dictionary(Of String, String))
	For Each M As Member In baseMembers
		paramDicts.Add(New Dictionary(Of String, String) From {{"Child", M.name}})
	Next
	' launch execution in parallel. The sequence will have one step, calculating the member
	Parallel.ForEach(paramDicts, _
		Sub(paramObj)
			BRApi.Utilities.StartDataMgmtSequence(si, "FCSeq", paramObj)
		End Sub)