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

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vitez
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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.

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martin
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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

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vitez
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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.

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vitez
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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.

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martin
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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?

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vitez
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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.

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vitez
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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

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martin
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

vitez wrote:

bez TLS:
WinSCP 90MB/s
FileZilla 115MB/S
Bez TLS (bez sifrovani)? Nebo bez TLS 1.3 (tj. s TLS 1.2)?

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vitez
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Re: WinSCP 5.17.6 transfers at less than half the speed than FileZilla 3.48.1

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

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