Calling R from Java - Faster alternative to RCaller

Question

I tried RCaller 2.0 to call R functions from Java and I managed to make it work after a few tries. Integration was pretty easy but RCaller is kinda slow at runtime. I'm afraid that RCaller 2.0 won't be suitable for my application since I have to repeatedly call the same script thousands of times and the latency introduced by this library is unacceptable for my needs.

Is there a faster (in terms of run-time execution time) alternative for calling R scripts from Java?