Siesta talk for YAPC::Europe, and acknowledged arrangements for travel.
Played about with making Devel::LeakTrace not be such a drag factor.
My first idea was to simply spool out the information about all allocated SVs on every new line, rather than updating hashes on the fly. That was really fast, for the simple case, but for a more complex script the file grew and ate all my diskspace in a couple of seconds.
The next plan is to use a pair of bitvectors to gate the GHash updates since for a lot of lines new SVs won't be getting allocated.