EQ is a finicky client. I used to blame THF for my woes before I went back to live and discovered it was my IP

The fact that the client assigns random ports from the zone server, so I end up with a dozen different open ports, any number of which are impossible to predict and leave open. If there's any kind of lag between me and the raid, I hang up and the server won't update pertinent data with my client. And this is all with live servers, it's only exacerbated on emu servers! I think it's just one of those things ya have to live with (I had to address my IP blocking ports to random zone servers by connecting through a VPN)
Basically what I'm saying is, box as many toons as you box on another server in an open zone with other players that has as many scripts as HoH does (however highly optimized it may be

) and you're going to have lag issues

Enter lag issues on an EQ client and you're going to have desync issues.