Slower WebDAV speed compared to FTPRush when using TLS encryption

Dear WinSCP support team,

I setup a WebDAV server locally with my network have 600M/s bandwidth, tested single file download speed for both free WebDAV client WinSCP 5.19.5 and FTPRush 3.4.6.

Here is my result.

---

No encryption:
WinSCP: ~72M/s
FTPRush: ~70M/s

With TLS encryption (ECDSA-256 Algorithm)
WinSCP: ~32M/s (only around 40% compared to no encryption)
FTPRush: ~68M/s (around 95% compared to no encryption)

---

From the result you can see that under TLS encryption environment, FTPRush can still keep around the same speed compared to no encryption, but WinSCP only can get around 40% speed compared to no encryption. Could you please figure out and fix the speed of TLS encryption of WebDAV connection? Appreciated for that. You can easy to setup the environment, FTPRush can be download from https://www.ftprush.com, WebDAV server software can be download from GitHub: https://github.com/hacdias/webdav, below are the commands I used to generate key and cert by OpenSSL, for your reference.
Best Regards,
Thomson

Did you check if WinSCP maxed out its CPU core?

Hello Martin,

Thanks for your support. I double checked their CPU utilization.
WinSCP: 20MB/s with 30% CPU utilization
FTPRush: 68MB/s with 50% CPU utilization

Does any option can help me increase the speed? Thanks.

Best Regards,
Thomson

Hello Martin,

I checked FTPRush's option, found that it had transfer buffer with default size 100K and maximum size 1000K. Does it the reason to increase the download speed? Only for your reference.

Best Regards,
Thomson

Sorry for my late answer. I was asking about particular CPU core, not about overal CPU utilization.