Help with the optimization

Hi everyone, i'm doing a server for my friends with 8 gb (we're like 10 ) and 30 mods,i'm precharging the map and i have changed some server properties bukkitt.yml and that things, but the precharge with chunky is so slow at 7-10 cps which i don't know if it normal or not.
So i need you to pls give me advices of how to optimizate the server for don't have lag. Sorry but i'm new in that and thanks for all.
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