Try to avoid Redim arrays. As far as performance is concerned, if you have a machine that is constrained by physical memory size, it's much better to set the initial dimension of the array to its worst-case scenario—or to set the dimension to its optimal case and redim as necessary. This does not mean that you should just go out and allocate a couple of megabytes of memory if you know you aren't going to need it.
The code below shows you gratuitous use of Dim and Redim.
<%
Dim MyArray()
Redim MyArray(2)
MyArray(0) = "hello"
MyArray(1) = "good-bye"
MyArray(2) = "farewell"
...
' some other code where you end up needing more space happens, then ...
Redim Preserve MyArray(5)
MyArray(3) = "more stuff"
MyArray(4) = "even more stuff"
MyArray(5) = "yet more stuff"
%>
It is far better to simply Dim the array to the correct size initially (in this case, that's 5), than Redim the array to make it larger. You may waste a little memory (if you don't end up using all of the elements), but the gain will be speed.
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