FreePIE latency?

Hi all,

I'm looking at writing some very basic code to support hydra + YEI 3-space + hillcrest + rift sensors - providing a very simple low latency interface to allow you to configure and store settings out of game, and then use it in whichever game. I've encountered FreePIE before, which promises much, but I've never used it. I'm worried about it being C# (I love the language, and would write apps using it, but not sure about libraries for native code to call into), and overall what impact on latency there is.

I've searched but haven't found any details, other than anecdotal 'it's not bad' or 'it's not noticeable'. Does anyone have any actual data on how much latency using FreePIE would add when using UDK or similar? If it's low, then it won't be worthwhile my writing my library. However if there's lots of room for improvement, then I may give it a stab.

Ian