Word VBA: Will unnecessary property flags slow down a macro? - vba

Question

I have a macro with hundreds of find and replace operations formatted as, for example:
With Selection.Find
.Text = "can't"
.Font.Italic = False
.Replacement.Text = "cannot"
.Forward = True
.Wrap = wdFindContinue
.Format = False
.MatchCase = False
.MatchWholeWord = True
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False
End With
Selection.Find.Execute Replace:=wdReplaceAll
I'm aware that all the .MatchCase = False etcs are unnecessary after the first time they're set to False, as Match Case will stay False until it's turned to True. My question is whether in a large macro like mine with hundreds of Replace operations and thousands of lines, will those unnecessary lines slow it down?
I just want to know if it'll make a difference before I spend ages going through and removing redundant lines.
(please don't shout at me for bad practice, the macro came together quite organically and became an official project when it was already really big)
Cheers!

Answer 1

The redundant lines won’t slow your operations down more than your use of Selection is already doing.
Replacing your hundreds of find and replace operations with code like this will speed things up a lot.
Sub CallingRoutine()
Application.ScreenUpdating = False
FindAndReplace "can't", "cannot"
FindAndReplace "don't", "do not"
Application.ScreenUpdating = True
End Sub
Sub FindAndReplace(findText As String, replaceText As String)
With ActiveDocument.Content.Find
.Text = findText
.Font.Italic = False
.Replacement.Text = replaceText
.Forward = True
.Wrap = wdFindStop
.Format = False
.MatchCase = False
.MatchWholeWord = True
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False
.Execute Replace:=wdReplaceAll
End With
End Sub

Answer 2

Your question is essentially will setting a flag to its default value would significantly hinder runtime performance. In short, the answer is no.
I went ahead and performed a test for you and setting a value to a property 1 million times, and here was the result:
Setting the MatchCase property 1 million times was so insignificant that it was quicker than 1 thousandths of a second.
So don't be worried about setting values to properties, even if the value is equal to the property's default.
With all that being said, performance varies greatly depending on your hardware. My testing hardware is probably not what would be used in most scenarios, but it doesn't really change the fact that you shouldn't have concern on setting these values.
For reference, I am running:
CPU: i9-10900KF
Memory: 32GB ADATA Running XMP # 3200 MHz
MB: Asus TUF Z490 Plus
I even ran another test, setting the value to True/False a million times, and obtained the same results:
And for those who want precise numbers: