I have a workbook containing a sheet with over 45K rows and abt. 55 columns (workbook is over 15 MB, so can't post it).
I need to find out whether that sheet contains a certain text.

Is there a fast way to do this?

Checking each cell takes ages. So does Find.

Somewhere on the internet I ran into a suggestion to use Replace iso Find.
Trying this manually looks very promising.
What I cannot find is how to detect (in VBA) whether a replacement actually occurred (thus telling me that the sheet contains the text I'm looking for).
MSDN suggests that Replace return some boolean, but I didn't yet manage to capture anything.

Any ideas how to do this?
Or any ideas how to do the find quickly?