Basically this will not increase performance, just availability as the main problem with load balancing is that it becomes a SPOF, if it goes down everything is

Basically this will not increase performance, just availability as the main problem with load balancing is that it becomes a SPOF, if it goes down everything is down no matter how powerful web servers you have in background. What will happen if one of those gets huge amount of traffic... I think that it will not go to the backup as CARP should work. But yes it would be nice to test that.