A machine learning engineer is working on scaling an ML pipeline by distributing its single-node model tuning procedure across multiple cores. After broadcasting the entire training data to each core, where each core can train one model at a time, the engineer finds the tuning process still slow. To speed it up, the engineer considers increasing the parallelism from 4 to 8 cores, but the total memory in the cluster cannot be increased. Under which condition would increasing the parallelism from 4 to 8 cores speed up the tuning process? Choose only ONE best answer.