All these tcp/ip stacks seem to be more suited towards using tcp over slip or ppp which is OK if you have a lot of data to send over unreliable networks,but for small data packets over fast networks such as ethernet then you are better off using udp which uses ip but is connectionless so doesnt require all the tedious setting up and taking down of connections everytime you want to send some data.
Of course if you want to use http or stuff like that then you do need tcp.