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GCP Batch always set max parallelism for tasks

Let's say that I have 10000 tasks in a job, is it right to say that setting parallelism to 1000 (the maximum allowed) is always the best solution? It will save time and the cost would be the same as setting parallelism to 1 since they would incur the same cpu hours.   Could the staff members @Wen_gcp  @wenyhu @bolianyin @Shamel  make sure that my understanding is correct? Thanks!