I think it is worthwhile to do an optimization for file transfers.

Here is a comparison of exactly the same client-server download with XRootd protocol and HTTP protocol:

CURL (single stream)
real 0m11.627s
user 0m0.208s
sys 0m1.882s

xrdcopy (single stream)
real 0m12.114s
user 0m0.206s
sys 0m3.642s

HTTP is on average 0.5s faster (~ 5%) and uses only 50% system time compared to xrdcopy.

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