It can be speed up a little bit but there is the problem of mana regen vs swing rate.
Very often, people training either have the mana regen but not the swing speed(1.25 per sec) or the swing speed but not the mana regen.
Everytime I've done ninja(I did one about 6 weeks ago), I do the following:
- drop every skill off my char except for weapon and ninja
- let focus and med raise... GM+ is better
- fastest weapon with the least stam requirement you can find(get to swing of 1.25 per sec)
- raise real int to 125
- pile on int, mana, mana regen, lmc, hci equipment, ideal is 40lmc, 45 hci and getting mana pool in the low 200 and mana regen around 18ish (hat of magi, rune beetle, pendent of magi, crystaline ring, mybook talisman,etc)
- death strike until out of mana
- stop attacking and make sure pet isn't attacking
- med to full
- start over again
My experience was almost no running out of mana and no med with 110 focus and 110 meditation. Still took a while but easy cheesy.
Adding in necro forms and shadow wisp are also very helpful.