Wowza works wonders... if you feed it the ram.
Wowza by nature will destroy disk IO if it cannot buffer the content, if the content is popular and not being sucked off the drive and cached then it will utterly destroy a server.
Not sure exactly but Wowza normally decreases bandwidth by about 30-40%.. not increase bandwidth. Alteast thats the case when people switch from nginx/lighttpd.
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