7bd509f73a
Nodes that are scheduled can be executed in any order in theory. So when there are many scheduled nodes, it can be benefitial to start evaluating them in parallel. Note that it is not very common that many nodes are scheduled at the same time in typical setups because the evaluator uses a depth-first heuristic to decide in which order to evaluate nodes. It can happen more easily in generated node trees though. Also, this change only has an affect in practice if none of the scheduled nodes uses multi-threading internally, as this would also trigger the user of multiple threads in the graph executor.
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