Just found out how to benchmark Heretic 2 (surprised nobody mentioned this before...):
downloaded standard.hd2 from
Alinea Computers page, created 'demos' drawer inside H2/base -drawer and copied standard.hd2 there, loaded up H2, put in settings
"Effects Detail 2 (one tick to the right), paletted textures = yes", entered console and wrote:
"timedemo 1
demomap standard"
test results:
screen res: 640x480
display: screen 13.2 fps
display: window 15 fps