Steve, you are correct, I was comparing Opus to my current production mix of G.711 and  G.722.  Here are more precise results on AWS M3.2xl instance with 8 CPUs for a 10 person conference with all clients connecting from Chrome via WebRTC.  
FS CPU usage was jumping more or less within these ranges throughout the conference:

PCMU: 4.3% - 5.0%
722: 7.6% - 8.3%
OPUS: 25% - 50%

On Thu, Apr 7, 2016 at 9:04 PM, Steve Underwood <steveu@coppice.org> wrote:
You should be seeing a significant different between G.711 and G.722, so
bundling them together doesn't make sense. G.711 takes only a minute
amount of CPU effort. G.722 takes a significant amount.

Regards,
Steve

On 04/08/2016 12:49 AM, Oleg Stolyar wrote:
> In my tests OPUS transcoding seems to consume 5-6 times more CPU then
> G.711 or G.722.
>
> On Thu, Apr 7, 2016 at 9:39 AM, Michael Jerris <mike@jerris.com
> <mailto:mike@jerris.com>> wrote:
>
>     I've seen estimates that opus is up to twice as heavy as g729.
>     webrtc encryption adds some (although not huge) load on top of
>     that.  20 opus sessions per cpu seems low, are these particularly
>     slow processors or virtual processors?
>
>
>     > On Apr 7, 2016, at 12:25 PM, Agustí Ubalde
>     <aubalde@presenceco.com <mailto:aubalde@presenceco.com>> wrote:
>     >
>     > Hi all,,
>     >
>     > I have found that the CPU usage with users WebRTC + OPUS is
>     high. With 2vCPUs, 10 users use 25% of CPU. Anyone know if this
>     load is normal?
>


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