GatherRewards in my console, 665 seconds.  11+ minutes.  We're getting pounded with lag drops crippling our server FPS and this and StackSizeController seem to be the culprits with staggering times.  Please update this asap.  Thank you.

is that stack modifier from killyou? 

stacksizecontroller is by AnExiledDev

Merged post

considering  stack modifier by Khan though, as it's been updated more recently (though still not completely current).