Reduce the complexity of the number of subnets routed, ACL’s, etc. Any rules that have to be processed or encryption will increase utilization. If this is the default gateway for a bunch of LAN devices, then consider putting another routing device in front of it to take some of the load and only push through the traffic that needs to go across the WAN links on the edge router, or redesign the LAN addressing scheme so traffic on the local LAN does not have to go to the router to be routed.
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