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My application is not web based, just need to use sockets to service around 1000 clients. Throughput and latency are of utmost importance to me. Currently using select() from NIO but thinking of moving on to asynchronous IO in NIO.2.
If you are using Infiniband networks I would suggest looking at the Asynchronous IO.
Comparing Java 7 Async NIO with NIO.
However if you are using regular ethernet, it is just as likely to slower as faster. The coding is more complicated than using non-blocking IO which is more complicated than using blocking IO.
If latency is of utmost importance I suggest you look at using kernel by-pass network adapters like Solarflare. However if a 100 micro-second latency is acceptable to you, it is unlikely you need this.