This semester, I'm teaching 3 advanced writing classes, which means that I have over 100 hundred, 5 paragraph essays of varying quality to grade. Here is my system to get it done in record time, with minimal brain fry-age.
I do it at home in my "office." It's a little room where I store my sports equipment. What is has going for is that I can spread out all my papers and it doesn't have my computer/phone. I divide my essays into groups of 8. Then, I do one pile at a time and in between each pile, I take a little mental-health break. I cook some dinner, or hang up a load of laundry or exercise or watch a TV show. It's the best way to see each paper with "fresh-eyes" and not "tired-eyes" because each student deserves a fair grade.