Chapter 23 WAN Optimization, Web Cache, Explicit Proxy, and WCCP : Before you begin : Distributing WAN optimization, explicit proxy, and web caching to multiple CPU Cores
  
Distributing WAN optimization, explicit proxy, and web caching to multiple CPU Cores
By default WAN optimization, explicit proxy and web caching is handled by half of the CPU cores in a FortiGate unit. For example, if your FortiGate unit has 4 CPU cores, by default two will be used for WAN optimization, explicit proxy and web caching. You can use the following command to change the number of CPU cores that are used.
config system global
set wad-worker-count <number>
end
The value for <number> can be between 1 and the total number of CPU cores in your FortiGate unit. Adding more cores may enhance WAN optimization, explicit proxy and web caching performance and reduce the performance of other FortiGate systems.