B4J Question Increase in ram usage in running application

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
    #VirtualMachineArgs:  -Dcom.sun.javafx.isEmbedded=true -Dcom.sun.javafx.touch=True -Dcom.sun.javafx.virtualKeyboard=javafx
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Button1 As Button
    Private Button2 As Button
    Private Button3 As Button
    Private Button4 As Button
    Private TextField1 As TextField
    Private TextField2 As TextField
    Private TextField3 As TextField
    Private TextField4 As TextField
    Dim Timer1 As Timer
    Dim ffd As Byte 
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    ffd = 0
    MainForm = Form1
    MainForm.WindowWidth = fx.PrimaryScreen.MaxX - fx.PrimaryScreen.MinX
    MainForm.WindowLeft = fx.PrimaryScreen.MinX
    MainForm.WindowHeight = fx.PrimaryScreen.MaxY - fx.PrimaryScreen.MinY
    MainForm.WindowTop = fx.PrimaryScreen.MinY
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    Timer1.Initialize("Timer1",2000)
    Timer1.Enabled = True
  
End Sub

Sub Timer1_Tick
    ffd = ffd +1
    If ffd = 1 Then
        MainForm.RootPane.RemoveAllNodes
        MainForm.RootPane.LoadLayout("Layout2")
    End If
  
    If ffd = 2 Then
        ffd = 0
        MainForm.RootPane.RemoveAllNodes
        MainForm.RootPane.LoadLayout("Layout1")
    End If
End Sub