Frequently, after using zenith for more than 24-28h memory usage follows a steady trend, reaching over 200MiB (used, not virtual) memory, as reported by zenith itself. This is not a sudden recent behavior, it has been there for at least one release.

Even when loading history, zenith starts at a much more reasonable ~18MiB.

Here are 2 memory profiles, that have run for over 24h. They were taken using valgrind's massif, with zenith built locally at d66adc5

For viewing, massif-visualizer is a pretty good tool to explore the profiles.