I think the code loading part will be the major difference - more code means more atoms, more binaries (from literals in those modules) and more ets usage (since information which modules are loaded is held in an ets table by the code_server process). Additionally there might be some more system-level services running like SASL or the release handlers, which could account for the extra process size. Have you tried comparing the outputs of Process.list() on both systems? That could shed some more light on it. Similarly for ets tables you could investigate with :ets.info.
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