I'm not proposing you add variables, I'm proposing you don't recalculate a value that you already have.
Why don't you do something like ME.labBand.text = Vbanda & " KB/s" instead of ME.labBand.text = (Impostazioni.Calc_banda(pausa)) & " KB/s"
You already have the value of the band (either Vbanda +10, or MaxBanda), so just reuse it to display.
I'm not proposing you add variables, I'm proposing you don't recalculate a value that you already have.
Why don't you do something like Calc_banda( pausa)) & " KB/s"
ME.labBand.text = Vbanda & " KB/s"
instead of
ME.labBand.text = (Impostazioni.
You already have the value of the band (either Vbanda +10, or MaxBanda), so just reuse it to display.