Methods for removing, or leaching, cobalt or other diamond-diamond bonding catalysts from polycrystalline diamond compacts or other structures formed from polycrystalline diamond include leaching under conditions that simulate use of PDCs in a hot hole drilling environment. Responsive to receipt of a communication from a party, a reply is sent. During a first pass of task load balance, tasks are balanced across various CPUs to achieve a fairness goal, where tasks are allocated CPU resources in accordance to their established fairness priority value.