For me lag is afected when awaiting confirmation for anything, meaning server response is really slow....boost those servers up call local power plant.
Lagg - geologists awaiting confirmation
barrack queue
provision house qeue
packing troops with generals
puting buildings on upgrade (mines)
No hammer guy yet, but seems like you could use a hammer on your equipement.
Update: on adventure islands everything works great. So thumbs up for that. And overall I like the event thus far.