Hiding By Criteria Throughout Sheets?

I wrote a macro that hides every row that contains an "X" in column X for every sheet. The problem is that it runs very slowly (assumedly because it is checking every cell on every sheet). Is there a way to clean this up and make it run faster?

My code:
Sub HideRows()
Dim ws As Worksheet
For Each ws In ActiveWorkbook.Worksheets
Dim Cell As Range
For Each Cell In ws.Range("X:X")
If Cell.Value = "X" Then
Cell.EntireRow.Hidden = True
End If
Next
Next ws
End Sub