It's not really that surprising -- it needs to iterate over the mounts, find free blocks, and tell the disk controller to trim them; on a developer machine where there is usually a lot of data turnaround over a week, this usually has to process dozens of GB.
It's not really that surprising -- it needs to iterate over the mounts, find free blocks, and tell the disk controller to trim them; on a developer machine where there is usually a lot of data turnaround over a week, this usually has to process dozens of GB.