Hard to quantify, but I do rember some pretty huge clash back in the first days out of beta, especially around The Crown and the Tech Plants. My guess, probably around 200vs200 guys. Pretty massive. You still have some of those going on even today during peak times but I tend to avoid those when I can. Draw distance tends to drop to near zero meters with enemies (and friends) popping out of thin air everywhere eheheh. 24-48 vs 24-48 are the most enjoyable fights for me in this game, 12-24 vs 12-24 in small outposts. Things tends to go FUBAR with more than 48 ppl per side, both strategically and performance wise.