Parallel sync - PLEASE HELP

[BRN]

Hi dear everyone, my situation is this:
I want to copy from C to D and simultaneously copy C to E. Because C is SSD and D,E is HDD, is much faster to do this two sync simultaneously. In "Synchronization Settings" > "Performance improvements" I have number "2" on C drive and number "1" on D and E. But if I hit "synchronize" button, then I noticed that drive E haven't any load until drive D is synchronized first. Disk load info I have from task manager in Windows 10. Am I dumb and I forgot something? Please how to solve this? Thank you!
Branislav

[Zenju]

Currently each folder pair is processed one after another, but his may change in the future:
viewtopic.php?t=4708