REST modules performance comparison.

rest-performance

# Varnish caching
## List of 300 items
Requests per second:    6717.35 [#/sec] (mean) # RESTful Memcache render cache.
Requests per second:    7096.14 [#/sec] (mean) # RESTful Database render cache.
Requests per second:    6379.45 [#/sec] (mean) # RESTful No render cache.
Requests per second:    95.24 [#/sec] (mean)   # RESTWS
Requests per second:    1125.62 [#/sec] (mean) # Services
## List of 50 items
Requests per second:    6632.03 [#/sec] (mean) # RESTful Memcache render cache.
Requests per second:    7057.74 [#/sec] (mean) # RESTful Database render cache.
Requests per second:    7096.90 [#/sec] (mean) # RESTful No render cache.
Requests per second:    97.70 [#/sec] (mean)   # RESTWS
Requests per second:    4979.83 [#/sec] (mean) # Services

# No Varnish
## List of 300 items
Requests per second:    41.38 [#/sec] (mean) # RESTful Memcache render cache.
Requests per second:    34.03 [#/sec] (mean) # RESTful Database render cache.
Requests per second:    38.64 [#/sec] (mean) # RESTful No render cache.
Requests per second:    91.50 [#/sec] (mean) # RESTWS
Requests per second:    22.44 [#/sec] (mean) # Services
## List of 50 items
Requests per second:    39.52 [#/sec] (mean) # RESTful Memcache render cache.
Requests per second:    38.53 [#/sec] (mean) # RESTful Database render cache.
Requests per second:    41.36 [#/sec] (mean) # RESTful No render cache.
Requests per second:    84.00 [#/sec] (mean) # RESTWS
Requests per second:    45.48 [#/sec] (mean) # Services

@amitaibu, I updated the gist.