SSRS: Performance concerned with replace

Question

I'm trying to replace text in a field in an SSRS report with a lot of data. Are there any performance concerns between the following?

=iif(Fields!Field1.Value="Word 1", "Word 2", Fields!Field1.Value)

...and...

=Replace(Fields!thisItem.Value, "Word 1","Word 2")

Answer 1

Not enough to worry about in most cases

However, they are different expressions which is more important

• One is a check for a specific value followed by substitution
• The other scans a string for all occurrences of "Word 1"