Limit CPU Utilization on cli imports?

Is there a way to limit CPU utilization on CLI Imports. Anytime I import a large set of images, my entire host goes unresponsive. Using Docker on a 8 core, 24gb memory server. I get that it takes awhile to process, but I need a way to throttle it so it doesn't bring the host to it's knees but I couldn't find anything. Any ideas?
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