Did you get any service records from the seller? Any oil changes?
If not, change the oil give it a good check over (since it new to you) and vary the rpms until breakin is complete. Everyone breaks in their bikes differently so you will get varied answers. There is a link somewhere to the breakin rides, I can't find it right now. I am sure someone will link it, before I can find it for you.
Try running some seafoam through a tank of gas and see if the idle settles down. And lack of a break in will not make it sluggish. Most likely related to idle issues. (assuming the bike sat with gas, so has minor carb gum up)
If that don't work, post again and we can try to help further.
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