We also need to ensure that people aren't using a broadband connection to achieve non-classic levels of bandwidth. Limit all client transmissions to and from the P99 servers to 2.5kb/sec, and disable server-side filtering until it is added on the classic timeline:
http://www.tski.co.jp/baldio/patch/20010327.html
"Added server-side filtering for chat and combat messages. This will allow you to turn off guild chat, shouts, auctions, oocs, 'my misses', 'others misses', 'others hits', 'attacker misses me', PC spells (all options), NPC spells and Bard songs (all options) at the server instead of at the client. This can reduce that amount of data sent to you over your connection, and can help those with slower connections with better performance and connectivity."