packet loss with v2.4.x client on Windows 10

  • Short story - I am seeing packet loss (15-25%) with v2.4 OpenVPN client on Windows 10. No problem with v2.3.18 on Windows 10, also no problem with v2.4 on macOS.
    Server is running in bridge (tap) mode.

    I can reproduce this on any Win10, just downloaded one from, and added OpenVPN and our configuration. Tested from a few locations.
    But it seems that not all users experience this or otherwise I would receive many complaints. But a few users do.

    OpenVPN logs are clean, pfSense is working fine.
    Thanks in advance for any clues.