WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

It was the same speed difference (over a 1Gbit connection) with former versions of both programs, actually. WinSCP brings about 23MB/s both ways and FileZilla around 55/MB/s. The FTP server is my own, running pure-ftpd 1.0.47-3. Neither with WinSCP nor FileZilla is my FTP server CPU bound during transfers.
In both cases I am using FTP with explicit TLS 1.3, also for data.
Both FTP clients run on the same Windows 10 system. The speed difference can be reproduced at all times.

How did you check the CPU performance during transfer?
Did you check a specific CPU core? Or just the overall CPU?

martin wrote:

How did you check the CPU performance during transfer?
Did you check a specific CPU core? Or just the overall CPU?

All cpus. Not single CPU bound.

Using another PC on the same Gigabit LAN with Linux and lftp (again TLS 1.3 over both channels):
1073741824 bytes transferred in 19 seconds (53.23 MiB/s)
lftp defaulttrial@192.168.2.140:/>
So it seems to be a WinSCP problem.

Mám to vyzkoušet bez TLS 1.3?

vitez wrote:

Mám to vyzkoušet bez TLS 1.3?

Za pokus to urcite stoji.

vitez wrote:

martin wrote:

How did you check the CPU performance during transfer?
Did you check a specific CPU core? Or just the overall CPU?

All cpus. Not single CPU bound.

Prave na to se ptam. Je jedno z jader vytizene nebo ne?

martin wrote:

vitez wrote:

Mám to vyzkoušet bez TLS 1.3?

Za pokus to urcite stoji.

vitez wrote:

martin wrote:

How did you check the CPU performance during transfer?
Did you check a specific CPU core? Or just the overall CPU?

All cpus. Not single CPU bound.

Prave na to se ptam. Je jedno z jader vytizene nebo ne?

neni.
Zkusim bez TLS.

bez TLS:
WinSCP 90MB/s
FileZilla 115MB/S
zase s TLS 1.3:
WinSCP 27MB/s
FileZilla 42MB/s 1 jadro (ze 3) vytizene

vitez wrote:

bez TLS:
WinSCP 90MB/s
FileZilla 115MB/S

Bez TLS (bez sifrovani)? Nebo bez TLS 1.3 (tj. s TLS 1.2)?

martin wrote:

vitez wrote:

bez TLS:
WinSCP 90MB/s
FileZilla 115MB/S

Bez TLS (bez sifrovani)? Nebo bez TLS 1.3 (tj. s TLS 1.2)?

bez sifrovani

Diky za test.

martin wrote:

Diky za test.

Za malo.