Some things that could help with node wars and seige performance.
1. Remove all non-vendor npcs during war times. Currently all mobs are removed but take it a step further and remove all npcs that don't sell things. People don't necessarily need those during war times and usually leave the server unless they are participating anyways.
2. Clean up useless animations that don't have to do with war. Places like troll fortification, Trina fort, and hexe sanctuary as some examples have things that have useless animations that cause lag during node war and seige like npc manned hwachas, cannons, etc.
3. Clean up area obstacles such as barracades, little houses, and other random artifacts. These cause the game to have to render in all these things for fights which cause the game to slow down. By reducing the amount of random artifacts there are during node war and seige would improve performance.
4. Dump players off of the servers when you remove mobs. Another potential fix is when mobs are removed from the server kick all players off back to the server select screen that would clear out afk people off war servers and other people that aren't participating in the war and require people that are participating to log back in therefore reducing player counts on node war and seige servers before the wars start.