حالا من بقیه را نمی دونم اما من که از این دو کد استفاده کردم.
Button1.Enabled = False
Dim V1 As Double = 996585545.21556
Dim V2 As Double = 2522314498.8892241
Dim V3 As Double = 0
Dim I As Double = 0, J As Double = 0
Dim Time As Long = DateTime.Now.TimeOfDay.TotalMilliseconds
For J = 0 To 9999999999
V3 = V1 * V2
Next
Label1.Text = DateTime.Now.TimeOfDay.TotalMilliseconds - Time
Button1.Enabled = True
Button1.Enabled = false;
double V1 = 996585545.21556;
double V2 = 2522314498.8892241;
double V3 =0;
double I = 0; double J = 0;
double Time = DateTime.Now.TimeOfDay.TotalMilliseconds;
for (J = 0; J < 9999999999; J++)
{
V3 = V1 * V2;
}
Label1.Text =Convert.ToString ( DateTime.Now.TimeOfDay.TotalMilliseconds - Time);
Button1.Enabled = true;