I did this on three different systems, all with different hardware.

I started Trinity and accepted all defaults for a fresh profile. I 
then exited Trinity and rebooted each machine.

I logged in (command line), flushed the kernel cache, ran free, 
started Trinity, opened konsole, flushed the kernel cache, and ran 
free.

The default memory Trinity footprints, which excludes the memory 
usage before starting Trinity and includes the native video drivers:

* 111184 KB
* 119536 KB
* 134876 KB

Notes: I did not disable apps autostarted from 
$HOME/.config/autostart or disable the native video drivers. Thus 
the first two results on old hardware are closest to the actual 
default Trinity R14 footprint.

Darrell