I recently moved from searching for data by arrays to collections, but found
that my macros now take 2 or 3 minute to process whereas when I was using
arrays it took 2 or 3 seconds to do the same work. But I don't want to go
back to arrays because indexing is always alway error prone.

I could add a binary search subroutine to speed up the search, but I was
wondering if that's already included in the Collections class. So, how does
Collections use the key to look up an item? Is it a simple sequential
search? If the adds are made with the keys presented alphabetically (less
work than debugging a binary search subroutine), will it respond better?
Thanks.