On the way to rebuilding libgc for the C++ transition, I got sidetracked by optimizing wanna-build. First I tried replacing the manual regex and formatting that Wrap_DB uses with use of Storable's freeze and thaw on the hash instead. This resulted in a massive slowdown (almost twice as long to list the whole database). Then I tried replacing Wrap_DB with MLDBM using Storable, had to rewrite the code to minimize calls to FETCH and to correctly call STORE on MLDBM. This has resulted in a 3x performance improvement in all database access.