I suggest adding an option for a queue size of 1 in LuCI. 4 causes a load of 3-4 on my router, and sometimes makes the network connection stop responding for a while on (re)load. I have lots of RAM, the problem is the single core CPU. Setting it to 1 in the config file makes no difference for the load time, but reduces the OS load to below 2. I have enabled the nice option.