Yesterday me and my friends were smallscaling with a 3-5 people group. Blues have taken their scroll from Alessia and we were like "let's intercept 40 blues with 3 of us because YOLO". We fear, streak, negate, ultidump on the small bridge on the way to roe. We fight for a few moments and we die. No lag. Zero. Even though we were facing 40+blues.
Jumping a little bit forward (like 10 min) - we are taking some resources at Rayles, we decide to tag a keep, we open the outer, 7-8 blues show up, we start falling back aggroing all the npcs in the keep. Massive lag, player positions screwed up, skills don't hit, hp desynced. More and more blues show up but that does not impact the lag at all. After fighting for like 10-15 minutes we decide to wrap up because it is unplayable. You streak in direction you were aiming 2 sec ago, you are knocked off the top of a resource tower and do not take any damage, you take treb damage after 5 seconds, etc.
So before we log out someone makes a point that fighting 40+ blues was not laggy at all but fighting 12-15 of them was a turn-based-rpg. We started discussing it and few main differences were:
When we jumped them carrying scroll they were not buffed;
There were no npcs around.
I will keep monitoring these two circumstances and trying to get to similar situations to check if I can repeat no buffs-no lag and no npcs-no lag situations separately.