1. A method for performing reconciliation of resources represented in a graph of data as nodes, the method comprising: selecting an initial subset of the nodes of the graph for which reconciliation processing with a particular node is to be carried out by determining which of the nodes have the highest number of read accesses made to them in graph traverse operations, and including those nodes in the initial subset as most visited nodes; performing reconciliation processing between the particular node and each of the initial subset of nodes; and delaying reconciliation processing between the particular node and a further subset of the nodes of the graph for which reconciliation with the particular node is to be carried out.