This is very strange. May be the problem in mac's sockets. Results from my debian squeeze VM:
```
$ make benchmark
Publishing 4000 msgs with 1KB of content:
php benchmark/producer.php 4000
4.5509970188141
Consuming 4000:
php benchmark/consumer.php
Pid: 1713, Count: 4000, Time: 6.0034
Stream produce 100:
php benchmark/stream_tmp_produce.php 100
4.7042639255524
Socket produce 100:
php benchmark/socket_tmp_produce.php 100
0.56208086013794
```
Seems like NO_DELAY option just doesnt work in mac os.