1. The "percent" setting is relative to maximal image dimension (ie. image
width or height, whichever is larger).
Ref:
https://git.gnome.org/browse/gimp/tree/app/paint/gimppaintoptions.c?h=gimp-2-8#n591
And as far as I can see it *does* work as intended - eg. Paintbrush Tool
with Dynamics=Fade Tape
Yes, the way GIMP uses GLIB's memory allocation needs to be reviewed.
This problem was reported before in
https://bugzilla.gnome.org/show_bug.cgi?id=759874 (re-assigned to GEGL,
though I believe this is really a GIMP problem).
Try running GIMP thus:
export MALLOC_MMAP_MAX_=20
export MALLOC_M
