Too much stuff happening during the initial loading?
Although I think the worst hit should be when someone logs in and loads a lot of chunks.
BUT, all the quarries WILL load chunks right at server startup. Maybe look into that? Limit amount of quarries to 1 per person or something (but I would guess very few have more than one quarry even now)
EVE Online characters:
Daedalus II ex-CEO TOGOA, Daedalus III slave of Daedalus II
Little Molok Asura Engineer
"Trying is the first step towards failiure" - Homer Simpson