I didn't find anything on their listed website; do you know if Nightshade is intensive on your computer? My current computer is unable to handle Glaze at current so I've been hand-poisoning my images to my limited ability. And that'll never compare with what a computer can do

Yes it is. Luckily there is webglaze now, and there will be a web version of nightshade in time (combined). webglaze.cs.uchicago.edu/glaze/

have you tried webglaze from the same service?