i think 60% Player have problem whenever theres a BK event and people start spamming ts that will make huge fps drop even you use antilag skin, so my suggest is to make most bk weapon invisible. with this method i could play +13 without any fps drop while everyone spamming TS.
Data>item
Delete all axe(number).bmd file.
Delete all sword(number).bmd file.
Dont delete.
sword02.bmd
sword05.bmd
sword08.bmd
sword10.bmd
sword11.bmd
sword13.bmd
Delete all mace(number).bmd file
Dont delete
mace07.bmd
Some of weapon skin are still available you can see in loren NPC shop but all of them dont causes lag just beuroba.
And i suggest use this weapon skin made by Dream to replace what weapon you want by looking bmd item list
http://forum.infinitymu.net/showthread.php?55-BMD-Files-Information it doesn't increase any fps while using this skin.
extra information.
Axe10.bmd=SMOK
sword32.bmd=TYR rune bladew
sword36.bmd=Ares sword
these are most important weapon that need to replace since it cause huge fps drop and most of player have this weapon whenever few people spam TS only.
After doing this you might able to play +13 without any problem or just a lil fps drop if you have very low spec pc.