msgpack_unpack is super slow (30x times igbinary) on big data sets
In this example 1500x1500 array unpacking take 90 seconds !!! (only 34MB of data)
i can gzip this data in 0.1 sec

https://gist.github.com/parf/f05ca955a523657581b55c62fc982059

./igbinary-vs-msgpack.php
PHP Version: 5.6.20 @
Data set: array 1500 x 1500, performed 2 iterations, data-set-memory-usage: 1,306.0M
ALGO SIZE-RAW UNPACK1/sec PACK1/sec << time per one iteration
igbinary_serialize: 34,866,787 1.8 2.1
msgpack_pack: 34,348,503 51.9 1.3

./igbinary-vs-msgpack.php
PHP Version: 7.0.8 @
Data set: array 1500 x 1500, performed 2 iterations, data-set-memory-usage: 1,101.0M
ALGO SIZE-RAW UNPACK1/sec PACK1/sec << time per one iteration
igbinary_serialize: 34,866,787 3.3 0.63
msgpack_pack: 34,348,503 91.5 1.6