How do I use a custom match merge statement with threading?

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VB

As of right now, I have a match merge statement that uses a 3 to 5 part match. it takes approximately 440 seconds to complete 152,000 matches. However, I am looking to do threading to decrease the amount of time it takes.

for my threading I have this:

Public Sub create_threads()

       Dim Threads As New List(Of Thread)
       Dim x As Long
       Dim newthread As String

       x = Temptable.Rows.Count / Environment.ProcessorCount
       x = Math.Ceiling(x)

       For total = 0 To Environment.ProcessorCount - 1
           I3 = x * total
           I4 = x * (total + 1)
           newthread = "thread" + total.ToString
           Dim t As New Thread(Sub() Match_Merge())
           t.Name = newthread
           Threads.Add(t)
           t.Start()
       Next

       For Each t As Thread In Threads
           t.Join()
       Next

   End Sub

The issue I think I am having is its not breaking up the work. What I am trying to accomplish is to set a dynamic method scenario. So when match merge is called it will be separate instances of it.

What I have tried:

I was looking into creating dynamic methods, trying to follow the example: .net - Calling a method within a dynamic method in VB.NET - Stack Overflow[^] but it did not work.