Lag when joined to party in SP CAVE

When i join to a party, game become laggy. Once i left the party, there is no lag. Ping values are acceptable from statistics. What can be the reason ? (happening in SP cave)

I noticed that it was because i had too much enabled quests. Disabling them worked.

Well, if i enable a quest without walk script; it makes lag in game. (in bot even)

My question is now this one;
Why does phBot need script to do auto-quest even if that bot has auto-walk feature? @Ryan

If you enable every single quest it’s going to check each one while you’re at the training area.

It’s just an option because not everyone wants to use “auto quest” and it did not support it in the past with path finding.

so i don’t have to use script for quest?