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This spreadsheet contains information on benchmarking carried out with the major versions of libopus. This includes 0.9.14, 1.0.3 and 1.1. Benchmarking was carried out on a 256MB Raspberry Pi using the Raspbian OS (Debian derivative). These were all compiled natively on the machine using the current repo version of gcc 4.6.3 and with these optimisation flags:

-O2 -pipe -march=armv6j -mtune=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard

These were compiled with floating point enabled.

I used a clip of speech from a librevox recording which was re-sampled from 44.1khz to 48khz within audacity. The clip is 2 minutes long. I wrote a simple bash script that ran the encode at each complexity level and repeated 30 times to try and get a good average.

The different sheets contain the data and then the corresponding charts at 6, 16, 32 kbps. Unfortunately Google sheets does not do proper error bars but the standard deviation is in the data.
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The sample used is available herehttps://drive.google.com/file/d/0B2UOhhaYBtrKaU9QdFd1YlB3VXc/edit?usp=sharing
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Note: Changed how I gather speed. It is now elapsed time in seconds so lower is faster.
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