First VBA code... looking for feedback to make it faster - vba

Question

I wrote a small VBA macro to compare two worksheets and put unique values onto a new 3rd worksheet.
The code works, but every time I use if excel goes "not responding" and after 30-45sec comes back and everything worked as it should.
Can I make this faster and get rid of the "not responding" issue? is it just my computer not being fast enough?
I start with about 2500-2700 rows in each sheet I'm comparing.
Sub FilterNew()
Dim LastRow, x As Long
Sheets.Add(After:=Sheets(Sheets.Count)).Name = "New" 'Adds a new Sheet to store unique values
Sheets(1).Rows("1:1").Copy Sheets("New").Rows("1:1") 'Copies the header row to the new sheet
Sheets(1).Select
LastRow = Range("B1").End(xlDown).Row
Application.ScreenUpdating = False
For Each Cell In Range("B2:B" & LastRow)
x = 2 'This is for looking through rows of sheet2
Dim unique As Boolean: unique = True
Do
If Cell.Value = Sheets(2).Cells(x, "B").Value Then 'Test if cell matches any cell on Sheet2
unique = False 'If the cells match, then its not unique
Exit Do 'And no need to continue testing
End If
x = x + 1
Loop Until IsEmpty(Sheets(2).Cells(x, "B"))
If unique = True Then
Cell.EntireRow.Copy Sheets("New").Range("A" & Rows.Count).End(xlUp).Offset(1, 0)
End If
Next
Application.ScreenUpdating = True
End Sub

Answer 1

This belongs in Code Review, but here is a link
http://www.excelitems.com/2010/12/optimize-vba-code-for-faster-macros.html
With your code your main issues are:
Selecting/Activating Sheets
Copy & pasting.
Fix those things and youll be set straight my friend :)

Answer 2

instead of a do...loop to find out duplicate, I would use range.find method:
set r = SHeets(2).range("b:b").find cell.value
if r is nothing then unique = true else unique = false
(quickly written and untested)

Answer 3

What about this (it's should help):
Sub FilterNew()
Dim Cel, Rng As Range
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Sheets.Add(After:=Sheets(Sheets.Count)).Name = "New" 'Adds a new Sheet to store unique values
Sheets(1).Rows("1:1").Copy Sheets("New").Rows("1:1") 'Copies the header row to the new sheet
Set Rng = Sheet(1).Range("B2:B" & Sheet(1).Range("B1").End(xlDown).Row)
For Each Cel In Rng
If Cel.Value <> Sheet(2).Cells(Cel.Row, 2).Value Then Cel.EntireRow.Copy Sheets("New").Range("A" & Rows.Count).End(xlUp).Offset(1, 0) ' The only issue I have with this is that this doesn't actually tell you if the value is unique, it just tells you ins not on the same rows of the first and second sheet - Is this alright with you?
Next
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub