1. A system comprising: one or more first computing systems configured to: partition layout data representative of a physical layout of an integrated circuit (IC) to produce a plurality of layout sub-regions; perform netlist extraction on the plurality of layout sub-regions to produce a plurality of sub-region netlists; transmit the plurality of sub-region netlists to a plurality of second computing systems via a network, wherein the plurality of sub-region netlists are usable by the plurality of second computing systems to perform separate circuit simulations on ones of the plurality of sub-region netlists to generate partitioned simulation results; and merge the partitioned simulation results to produce a merged simulation result for the IC.