high CPU utilization when configure PBR policy based routing

Good Day all,

i run ISP with 600 ADSL clients. just bought 1100 MKR, configure PBR for PORT 80 pointing to caching server.
the CPU utilization shot up to 100% and router died with in 10 to 15 min.

i only shifted 150 clients :frowning:

please i need your valuble suggestino here.

thanks’