Only loads 72000 entries in Uproot:

Uproot 1 workers 24.546678066253662 seconds
Uproot 2 workers 25.4665744304657 seconds
Uproot 3 workers 25.975321769714355 seconds
Uproot 4 workers 25.52541756629944 seconds
Uproot 8 workers 26.553526878356934 seconds
Uproot 12 workers 25.88087773323059 seconds
Uproot 16 workers 25.625181913375854 seconds
Uproot 20 workers 26.116685152053833 seconds
Uproot 24 workers 26.196748971939087 seconds
Uproot 36 workers 27.081759929656982 seconds
Uproot 48 workers 26.33230233192444 seconds
Uproot 60 workers 26.263431310653687 seconds
Uproot 72 workers 26.597672939300537 seconds

[11, 60, 36, 5, 10, 6, 8, 24, 2, 16, 1, 72, 48, 3, 9, 20, 7, 12, 4]

Loads whole file 10 times:

Forth 1 workers 157.48073768615723 seconds
Forth 2 workers 74.59399843215942 seconds
Forth 3 workers 55.70393395423889 seconds
Forth 4 workers 42.757781744003296 seconds
Forth 5 workers 31.764143705368042 seconds
Forth 6 workers 44.46048140525818 seconds
Forth 7 workers 27.208353996276855 seconds
Forth 8 workers 36.381691217422485 seconds
Forth 9 workers 20.22704768180847 seconds
Forth 10 workers 18.13774561882019 seconds
Forth 11 workers 17.67407536506653 seconds
Forth 12 workers 14.885231971740723 seconds
Forth 16 workers 13.52955412864685 seconds
Forth 20 workers 11.843489170074463 seconds
Forth 24 workers 12.854336023330688 seconds
Forth 36 workers 8.28911566734314 seconds
Forth 48 workers 8.285134077072144 seconds
Forth 60 workers 9.091292142868042 seconds
Forth 72 workers 7.536222219467163 seconds

Doing the same thing a few more times:

Forth 1 workers 166.67164707183838 seconds
Forth 2 workers 76.41639614105225 seconds
Forth 3 workers 58.488378047943115 seconds
Forth 4 workers 43.71523976325989 seconds
Forth 5 workers 33.28856563568115 seconds
Forth 6 workers 33.49880313873291 seconds
Forth 7 workers 28.15760350227356 seconds
Forth 8 workers 22.32053828239441 seconds
Forth 9 workers 21.652956008911133 seconds
Forth 10 workers 19.691213130950928 seconds
Forth 11 workers 17.993410348892212 seconds
Forth 12 workers 16.32911229133606 seconds
Forth 16 workers 14.555362462997437 seconds
Forth 20 workers 12.161463499069214 seconds
Forth 24 workers 13.629037141799927 seconds
Forth 36 workers 8.774104118347168 seconds
Forth 48 workers 9.080953121185303 seconds
Forth 60 workers 9.876107692718506 seconds
Forth 72 workers 8.034755229949951 seconds

Forth 1 workers 143.58407044410706 seconds
Forth 2 workers 76.53130960464478 seconds
Forth 3 workers 58.68600058555603 seconds
Forth 4 workers 41.352006673812866 seconds
Forth 5 workers 35.17764353752136 seconds
Forth 6 workers 26.995579957962036 seconds
Forth 7 workers 24.947298288345337 seconds
Forth 8 workers 22.62899875640869 seconds
Forth 9 workers 19.94755744934082 seconds
Forth 10 workers 18.845850706100464 seconds
Forth 11 workers 18.09461259841919 seconds
Forth 12 workers 15.155261754989624 seconds
Forth 16 workers 12.250515460968018 seconds
Forth 20 workers 15.199743032455444 seconds
Forth 24 workers 10.489633083343506 seconds
Forth 36 workers 8.847702503204346 seconds
Forth 48 workers 8.059797286987305 seconds
Forth 60 workers 10.18899655342102 seconds
Forth 72 workers 7.851130485534668 seconds

Forth 1 workers 164.77360486984253 seconds
Forth 2 workers 79.5792248249054 seconds
Forth 3 workers 51.904799699783325 seconds
Forth 4 workers 38.01700711250305 seconds
Forth 5 workers 35.39278435707092 seconds
Forth 6 workers 28.524214506149292 seconds
Forth 7 workers 25.13274049758911 seconds
Forth 8 workers 20.860453367233276 seconds
Forth 9 workers 19.622976779937744 seconds
Forth 10 workers 19.517585515975952 seconds
Forth 11 workers 17.934651851654053 seconds
Forth 12 workers 15.805314540863037 seconds
Forth 16 workers 14.611515998840332 seconds
Forth 20 workers 11.121246337890625 seconds
Forth 24 workers 13.855790853500366 seconds
Forth 36 workers 8.620692491531372 seconds
Forth 48 workers 8.087448120117188 seconds
Forth 60 workers 10.157726287841797 seconds
Forth 72 workers 7.922816038131714 seconds