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7020100
(Get the code!)
So by "first time" you mean first time from fresh boot; there's no package installation involved then. I think you're slightly wrong about memory usage, because the fact that every SystemToolsBackends perl process uses 10MB doesn't mean you can sum up those values to get the total: there's shared memory (reported as SHR in top) for about 2MB each, which explains why a quick test reports that 70MB are used.
There's something I don't get here, because the scripts in themselves only represent a few KB, so I'd expect the total memory usage to be about 15MB. Maybe there's something we're doing wrong in the way we manage memory.
Anyway, the best approach for now would be to stop starting all modules, and instead start the one we use. We could divide the footprint by 5 or so.