Using socket.recv() with small values is expensive

[alippai]

Using the file-like object with read(1) is better if you set up buffering eg. using socket.makefile(mode='rb', buffering=1024*1024). Avoiding frequent system calls caused by recv() the data row fetching can double the throughput (on large datasets).

[sitingren]

@alippai Thanks for your suggestions! Please feel free to make a pull request for this improvement.

[alonme]

closed by #441.