Extreme Memory Leak with Version 4.0+

[Shonumi]

Sounds pretty odd. If this problem was introduced in between 3.5 and 4.0, you should probably find the revision that first introduced the issue. This will help the devs fix it, if indeed it's a valid issue. You should test revisions by bisecting them (google it) so you don't end up testing thousands of revisions, but rather a dozen or so.