sorry i took too late to respond
my grandma is dead lately

however i will put my latest values of profile
it seems to me it lasts very long on standby
but a continues usage it will take about 2 - 4 percent each 10 minutes
i guess that's good for me
will see for others
and if you made vfs cache 100 again
you will get the previous old status
very short standby time
and a bit longer of continues usage

i prefer a long standby time