System information

• Steam client version (date): Feb 18 2019
• Distribution: Debian Buster
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes

Description:

I upgraded my Steam client to Feb 18 build and faced a severe issue.
The download speed is extremely low (0-100 Kb/s). Before the upgrade the speed was 10-15 Mb/s (on January build).
When I monitor the network load, I can see that it is extremely uneven (sequence of peaks, the third row in the screenshot).

This issue appeared right after I upgraded from Jan 4 2019 build to Feb 18 2019.
I tried using beta version as well, the issue is present.
Perhaps, it is connected with this issue.

P.S. Sorry for two issues in a row.