Help: Massive lag when walking by NPCs in towns.

I'm not sure if this is the right place to put this. Recently I downloaded Maple again to try Hayato. Despite a little bit of lag everything was going fine, but that was until I got close to Cassandra / Gaga / Maple Admin. The game starts lagging massively and it only gets worse the longer I stay, it seems to be consuming all of my comp's memory because even the numberpad's light on my keyboard freezes when this is happening.

My comp is slow, I don't even have a graphic's card, but I don't think this is related to all NPCs but just those three because again, all was fine until I got close to them. I also remember reading about this issue here before so, is there any way to fix/get around this?