In reply to Quentin.

You are right of course. Sorry about the mixed up message.
And to complement my point:
1- When I/Os are divided by 10, the load is much more balanced between the CPU and I/O resources. Indeed, whenever I use SPDE, I almost always set option compress=binary.
2- The only case where this might not be beneficial is when CPU is at a premium, for example on mainframes, and where storage space is not an issue.