Macros are run slowly

[ajl_ahmed]

I have created four macros on sheet 1. When pressing on any macro, the process has run slowly. I do not know the reason. is there any problem with the code? Is there a faster way to do a "loop" or "if" operations or a better way to write this code? I have attached the code for these macros.
Regards

Sub Page1()
   Dim x As Integer
   Dim Y As String
    Y = Range("B12")
      If Y = "" Then
      Sheets(1).Range("1:50, 151:" & Rows.Count).EntireRow.Hidden = True
      MsgBox "No student's names are included on this page, please select other pages", vbExclamation
      Exit Sub
      End If
    Sheets(1).Rows.Hidden = False
    Sheets(1).Range("51:100,151:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 2
Sheets(1).Range("101:150,151:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 3
    x = WorksheetFunction.Match("D", Range("S:S"), 0)
For r = 1 To 147
        If Sheets(1).Range("S" & r).Value = "D" Then
            Sheets(1).Range("S" & r).EntireRow.Hidden = True
       End If
     Next
     
End Sub
Sub Page2()
Dim x As Integer
Dim Y As String
'Deleting the blank cells
Sheets(1).Rows.Hidden = False
Y = Range("B62")
      If Y = "" Then
      Sheets(1).Range("51:100, 150:" & Rows.Count).EntireRow.Hidden = True
      MsgBox "No student's names are included on this page, please select other pages", vbExclamation
      Exit Sub
      End If
x = WorksheetFunction.Match("D", Range("S:S"), 0)



Sheets(1).Range("1:50,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 1
Sheets(1).Range("101:150,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 3

For r = 1 To 150
        If Sheets(1).Range("S" & r).Value = "D" Then
            Sheets(1).Range("S" & r).EntireRow.Hidden = True
       End If
     Next
End Sub


Sub Page3()
    Sheets(1).Rows.Hidden = False
    Dim x As Integer
    Dim Y As String
'Deleting the blank cells
Sheets(1).Rows.Hidden = False
Y = Range("B112")
      If Y = "" Then
      Sheets(1).Range("101:150, 150:" & Rows.Count).EntireRow.Hidden = True
      MsgBox "No student's names are included on this page, please select other pages", vbExclamation
      Exit Sub
      End If
x = WorksheetFunction.Match("D", Range("S:S"), 0)



Sheets(1).Range("1:50,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 1
Sheets(1).Range("51:100,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the  page 2

For r = 1 To 150
        If Sheets(1).Range("S" & r).Value = "D" Then
            Sheets(1).Range("S" & r).EntireRow.Hidden = True
       End If
     Next
End Sub


Sub AllPages()

Dim r As Integer
Dim x, u As Integer

'Deleting the blank cells
Sheets(1).Rows.Hidden = False

x = WorksheetFunction.Match("D", Range("S:S"), 0)
 
If x >= 12 And x <= 46 Then
Sheets(1).Range("51:150,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the page 1 and 2
End If
     
 If x >= 62 And x <= 96 Then
Sheets(1).Range("47:50,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the % of page 1
Sheets(1).Range("101:111,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the header page 3
Sheets(1).Range("147:150,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the % of page 3
End If

If x >= 112 And x <= 146 Then
Sheets(1).Range("47:50,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the % of page 1
Sheets(1).Range("97:100,150:" & Rows.Count).EntireRow.Hidden = True    'Deleting  the % of page 3
End If

For r = 1 To 150
        If Sheets(1).Range("S" & r).Value = "D" Then
            Sheets(1).Range("S" & r).EntireRow.Hidden = True
       End If
     Next
End Sub

[#2]

You're just modifying a lot of data in the excel file at one time. it will run slow.

[#3]

@ajl_ahmed 

https://techcommunity.microsoft.com/t5/excel/help-with-macro-hygiene-please/m-p/3568358#M153475

Maybe it helps, if not please ignore.

[#4]

is it possible to re-write the code in way which make the processing faster?