billybond,
Regarding the slow runtime, I'd be interested to hear if you have an idea of where the hotspot is, if you can identify it.
If you are using version 1.5.5 or the latest 'default' branch, there are known runtime performance issues for converting large R vectors to C#, but creating R vectors from large C# numeric arrays should be already as efficient as can be. The former issue will be resolved in the next release (currently the fix is on a branch)
Regarding the slow runtime, I'd be interested to hear if you have an idea of where the hotspot is, if you can identify it.
If you are using version 1.5.5 or the latest 'default' branch, there are known runtime performance issues for converting large R vectors to C#, but creating R vectors from large C# numeric arrays should be already as efficient as can be. The former issue will be resolved in the next release (currently the fix is on a branch)