Optimize slow code that has lots of "for" and "if" - excel

Question

I have three main sheets: "inputs","variables" and "result". The sheet "inputs" has a list with 150 cells with inputs by the user, the sheet "variable" has a list with more than 30 000 points and "result" is the result of the code.
The code takes a point from the sheet "inputs", searches this point in the "variables" sheet, takes a bunch of information from this sheet an pastes them in the "result" sheet. However the process is really slow, it takes from 7 to 9 minutes to find the 150 inputs. There is any way I can make it faster, or at least half of the time?
The simplified version of the code is shown below, the actual code has at least 5 "for" and 4 "if", due to a lot of conditions presented in the "input" section
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Dim ws1 As Worksheet
Dim ws2 As Worksheet
Dim ws3 As Worksheet
Dim tag As String
Dim var As String
Dim input As String
Dim i As Integer
Dim j As Integer
Set ws1 = Worksheets("inputs")
Set ws2 = Worksheets("variable")
Set ws3 = Worksheets("result")
For i = 2 To ws2.Range("C" & Rows.count).End(xlUp).Offset(1).Row
For j = b To ws2.Range("C" & Rows.count).End(xlUp).Offset(1).Row
var = ws2.Cells(j, 4)
input = ws1.Cells(i, 2), 12, 40)
If var = specs
DO STAFF HERE
End If
Next j
Next i
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub

Answer 1

You should try saving into an array the looping through said array! always seems to improve efficiency but a loop inside a loop is never great in terms of O(n2) and all that!
Dim varr As Variant
Dim j as long
varr = ws2.Range("C1:C" & ws2.Range("C" & Rows.count).End(xlUp).Row).value
For j = LBound(varr) To UBound(varr)
If varr(j, 1) = specs then
end if
Next j