The whole logfile is too personal. I feel comfortable showing the end here. I did get it to fluctuate a couple times but never made it to 70MBs only about 45 and getting it to drop to 15 opening chrome.

[quote]. 2024-12-17 12:45:09.713 [Background 3] Startup conversation with host finished.
. 2024-12-17 12:45:09.713 [Background 3] Adding a parallel transfer to the transfer started on the connection "Background 1"
. 2024-12-17 12:45:09.714 [Background 3] Starting transfer of "MYFILE" part 2 from 21475535530 until the EOF
. 2024-12-17 12:45:09.714 [Background 3] File: 'MYFILE' [2024-12-17T17:44:37.000Z] [32213303296]
. 2024-12-17 12:45:09.714 [Background 3] Copying "MYFILE" to local directory started.
. 2024-12-17 12:45:09.714 [Background 3] Binary transfer mode selected.
. 2024-12-17 12:45:09.714 [Background 3] Opening remote file.
> 2024-12-17 12:45:09.714 [Background 3] Type: SSH_FXP_OPEN, Size: 57, Number: 1395232771
< 2024-12-17 12:45:09.744 [Background 3] Type: SSH_FXP_STATUS, Size: 24, Number: 1395232516
. 2024-12-17 12:45:09.744 [Background 3] Discarding reserved response
< 2024-12-17 12:45:09.744 [Background 3] Type: SSH_FXP_HANDLE, Size: 13, Number: 1395232771
> 2024-12-17 12:45:09.744 [Background 3] Type: SSH_FXP_FSTAT, Size: 13, Number: 1395235848
< 2024-12-17 12:45:09.774 [Background 3] Type: SSH_FXP_ATTRS, Size: 37, Number: 1395235848
> 2024-12-17 12:45:09.774 [Background 3] Type: SSH_FXP_READ, Size: 25, Number: 1395239173
. 2024-12-17 12:45:09.901 [Background 3] Skipped 31 SSH_FXP_READ packets
< 2024-12-17 12:45:09.901 [Background 3] Type: SSH_FXP_DATA, Size: 32761, Number: 1395239173
. 2024-12-17 12:46:43.596 [Background 3] Initiating key re-exchange (too much data received)
. 2024-12-17 12:46:43.684 [Background 3] Doing NTRU Prime / Curve25519 hybrid key exchange, using hash SHA-512 (unaccelerated)
. 2024-12-17 12:46:43.867 [Background 3] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] outbound encryption
. 2024-12-17 12:46:43.867 [Background 3] Initialised HMAC-SHA-256 outbound MAC algorithm
. 2024-12-17 12:46:43.867 [Background 3] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] inbound encryption
. 2024-12-17 12:46:43.867 [Background 3] Initialised HMAC-SHA-256 inbound MAC algorithm
. 2024-12-17 12:46:53.920 [Background 1] Initiating key re-exchange (too much data received)
. 2024-12-17 12:46:54.073 [Background 1] Doing NTRU Prime / Curve25519 hybrid key exchange, using hash SHA-512 (unaccelerated)
. 2024-12-17 12:46:54.252 [Background 1] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] outbound encryption
. 2024-12-17 12:46:54.252 [Background 1] Initialised HMAC-SHA-256 outbound MAC algorithm
. 2024-12-17 12:46:54.252 [Background 1] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] inbound encryption
. 2024-12-17 12:46:54.252 [Background 1] Initialised HMAC-SHA-256 inbound MAC algorithm
. 2024-12-17 12:46:59.399 [Background 2] Initiating key re-exchange (too much data received)
. 2024-12-17 12:46:59.498 [Background 2] Doing NTRU Prime / Curve25519 hybrid key exchange, using hash SHA-512 (unaccelerated)
. 2024-12-17 12:46:59.711 [Background 2] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] outbound encryption
. 2024-12-17 12:46:59.711 [Background 2] Initialised HMAC-SHA-256 outbound MAC algorithm
. 2024-12-17 12:46:59.711 [Background 2] Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] inbound encryption
. 2024-12-17 12:46:59.711 [Background 2] Initialised HMAC-SHA-256 inbound MAC algorithm
. 2024-12-17 12:47:53.420 [Background 2] Skipped 49268 SSH_FXP_READ and 49299 SSH_FXP_DATA packets
> 2024-12-17 12:47:53.420 [Background 2] Type: SSH_FXP_CLOSE, Size: 13, Number: 1432896772
. 2024-12-17 12:47:53.420 [Background 1] Skipped 47748 SSH_FXP_READ and 47779 SSH_FXP_DATA packets
> 2024-12-17 12:47:53.420 [Background 1] Type: SSH_FXP_CLOSE, Size: 13, Number: 1432897028
. 2024-12-17 12:47:53.541 [Background 3] Skipped 53497 SSH_FXP_READ and 53528 SSH_FXP_DATA packets
> 2024-12-17 12:47:53.541 [Background 3] Type: SSH_FXP_CLOSE, Size: 13, Number: 1432897284

Please post complete session log file and corresponding exact times when the CPU usage changed.

I'm starting to notice any spike in CPU% will instantly drop my speeds. If I close down some apps and wait, speed will climb up to normal ~70/MBs. As soon as I launch a browser it will drop to about 10–14, then slowly climb back up. The real problem is if apps are using a small bit of CPU like just 10% – watching a video, or a game, the speed will remain slow even tho my CPU is not maxed out total could be 15–20%.

This does not happen with other apps like usenet or Steam. My speed remains fast no matter what I'm doing on the computer. I use Windows 10 pro and have a 7th gen i7 CPU. I don't know what other relevant information would be needed. I found the post about disabling 'optimize connection buffer size', but mine already is. I tried a couple different WinSCP versions but currently using the 6.4 beta.