Hey hows a going,

Ive started using my mac to download torrents, im experiencing some problems with speed, its not a seeder issue (large amount of seeds on torrents)

Ok so the problem is with speed, im maxing out my speeds when i download using my PC, 1mb down no problem, but with the mac downloading the same file my speeds have been jumping all over the place from as low as 20 to about 400 max averaging 200 k down id say. ive been looking through vuze preferences and everything seems in order,
could it have something to do with the mac os x firewall?

thanks for any help