(no modifiers no fastlist)
ouch
Transferred: 234.315 KiB / 234.315 KiB, 100%, 6.326 KiB/s, ETA 0s
Checks: 8967 / 8967, 100%
Transferred: 6 / 6, 100%
Elapsed time: 1m0.1s
With your --checkers=16 --drive-pacer-min-sleep=10ms mods. x4.97 increase in the first minute.