Teaspoon, this was definitely one of the ideas we had, but the performance hint of doing the I/O with another process is basically almost as bad as the socket in between. The problem is not just the amount of bandwidth (but it is one of the problems when there are a massive number of clients, we have an use case that I can't mention in detail about this). But also the problem is, the I/O is where most of the time is spent, and it is a shame. With Lua scripting we fix part of this problem allowing to deliver more performances.

Proof is what it was possible to do with variable argument list push. You can push something like 350k items per second per core just using an LPUSH with a few more arguments per item.