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Child to MDI form halts everything

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Hi.
I'm trying to load and put a form to an MDI parent.
Whatever I try, the loading child form will halt the UI of the parent form.

The main loading functions are on the frmchild.show() aka frmchild.Load .

Is there anything that can be done except running the child load even async?

This slows the execution:

Code:

  Dim thr As New Threading.Thread(AddressOf addmoremdis)
        thr.Start()

  Sub addmoremdis()
        Dim dlg As New add_mdi(AddressOf addmdi)
        Dim frr As New FrmProChild
   
        frr.PC = "192"

        Me.Invoke(dlg, New Object() {frr})

    End Sub
    Delegate Sub add_mdi(ByVal frm As Form)
    Sub addmdi(ByVal frm As Form)
        frm.MdiParent = Me
        frm.Show()
    End Sub

This worked once, possibly I got it on invocation but it halted the mdi form again , after that I get cross thread exception:
Code:

    Dim frr As New FrmProChild
   
        frr.PC = "192"
        frr.MdiParent = Me
        BackgroundWorker1.RunWorkerAsync(frr)

 Private Sub BackgroundWorker1_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Dim formInstance As Form = CType(e.Argument, Form)

        Try
' I can do that but what's the point, it will slow'
'            Me.InvokeIfRequired(Sub()
 '                                  formInstance.Show()
  '                              End Sub)

            formInstance.Show()

        Catch ex As Exception

        End Try

    End Sub

This slows the execution:
Code:

frr.BeginInvoke(New MethodInvoker(AddressOf frr.Show))
I've read that maybe if you put work workload on sub new but I can't do that as I I need heavy controlling manips.

What I'm thinking, if everything else fails is to have an async function inside the child Load, but that will take me a week to do so.
But OK if there is no other way...

Thanks.

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