I have some 4700 routers and 2800 routers. the performance of 4700 is better than 2800. I configure some VPN channels on 4700. I find that the CPU loading of 4700 is near to 100% when the VPN consumes 2M - 3M traffic.
In 2800, it does not have this issue.
Why? is it 4700 is too old (hardware) to handle the new feature?