FTPS slowed down at 4.5

Hi there,

I recently upgraded lftp from 4.2.2 to 4.6.5 and I noticed that FTPS slowed
down quite a bit. I bisected versions and determined that the slowdown
began at 4.5.0 and continues through 4.7.1. With 4.4.16 I'm peaking at 53
M/s downloads (with pget -n 5) with this server but with 4.5.0 I'm peaking
at ~330 K/s (again, with pget -n 5) with the same file and server.

This isn't expected, right? I can't see anything in the debugging info
that's different between 4.7.1 and 4.2.2 to explain the difference in
speeds and I'm using the same options:

set dns:order inet
set xfer:clobber true
set ftp:use-quit false
set net:max-retries 3
set ssl:verify-certificate no
set ftp:ssl-allow true
set ftp:ssl-force true
set ftp:ssl-protect-list true
set ftp:ssl-protect-data true
set ftp:ssl-protect-fxp true
set ftps:initial-prot ""

Any idea on things I can try to improve the throughput?

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