Hi Julian,
somehow reproducing this from the same dictionary loaded from a savefile yields less dramatic results. Here is what I am doing:

sage: # this will downlod roughly 150 Mb of data
load("http://people.disim.univaq.it/~salvatore.stella/tmp/bar.sobj";)
Attempting to load remote file: 
http://people.disim.univaq.it/~salvatore.stella/tmp/bar.sobj
Loading started
Loading ended
sage: # make a new dictionary so that we do not use any cached data sage: foo = dict(bar.items())
sage: save(foo,"/tmp/foo")

This uses "only" 5 Gb of RAM.

I will have a look at memray and report back but first I'll probably try to reach you on zulip.
Thanks
S.

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