Processing Power of R-200 and R-190 Routers

Can someone post the difference in processing power of the R-200 & R-190 Routers.

We seem to be having problems on some R-200 routers that are loaded up with many Port Forwarding entries to many devices of being able to keep up with the constact flow of traffic though the R-200 routers. 

Are the R-190 routers have increased processing power over the R-200 routers.

What is the processing power of the other higher dollar Cambium routers in relation to the R-200 and R-190 routers.