Compiler String Efficiency

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What is most efficient and what is the difference in the amount of
string memory allocated (in the calling routine) between:

1) Passing a string directly to a function where the function requires
a string parameter?

e.g. OpenRecordSet("tblMyStuff")

2) Just allocating a VB String

e.g. Dim strTableName As String
strTableName = "tblMyStuff"
OpenRecordSet(strTableName)

3 Allocating the exact string size

e.g. Dim strTableName As String
strTableName = Space$(10)
strTableName = "tblMyStuff"
OpenRecordSet(strTableName)

Thanks
David

.

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