I had a bunch of training videos packed as zips — about 40, and sizes were from tens of megabytes to a couple of gigabytes. So I selected them all, and pressed

I had a bunch of training videos packed as zips — about 40, and sizes were from tens of megabytes to a couple of gigabytes. So I selected them all, and pressed cmd+o which launched unpacking. They were processed 4 at a time, but for a whole time CPU, according to iStat menu, was 90-93% idle.