I was hacking in image.c today, and was compiling Emacs several times;
after some time I thought I saw some slowdown in term.

I can see pmem is on ~74%; and Emacs is eating about 25 gig of ram.

I haven't used Dired today at all.

I took some pmap dump; no idea if it can help, but maybe you would like
to look at it anyway.