So an update: we cherrypicked a revision that fixed the main source of extreme memory usage, but memory usage is still high, if not so ridiculous as before.
Unfortunately, my cardboard and sticky tape monitoring system seems to have stopped working, so it's hard to quantify how bad the situation is now. I'll put it back together, but I think it's safe to downgrade this from Critical to High (Tom is free to disagree on this point).
So an update: we cherrypicked a revision that fixed the main source of extreme memory usage, but memory usage is still high, if not so ridiculous as before.
Unfortunately, my cardboard and sticky tape monitoring system seems to have stopped working, so it's hard to quantify how bad the situation is now. I'll put it back together, but I think it's safe to downgrade this from Critical to High (Tom is free to disagree on this point).