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Wireguard and my Buster kernel

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/var/log/kern.log contains these lines:

Jul 19 09:15:38 debian kernel: [69157.444725] wireguard: module 
verification failed: signature and/or required key missing - 
tainting kernel
Jul 19 09:15:38 debian kernel: [69157.449554] wireguard: 
WireGuard 1.0.20200712 loaded. See www.wireguard.com for 
information.
Jul 19 09:15:38 debian kernel: [69157.449555] wireguard: 
Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. 
All Rights Reserved.

This is an old HP amd64 running as noted:

$ uname -a
Linux debian.localdomain 4.19.0-14-amd64 #1 SMP Debian 
4.19.171-2 (2021-01-30) x86_64 GNU/Linux

Principal symptom: pervasive slowdown of all connections to 
remote hosts, notice first with my smtp smart host.

I am resigned to reinstalling my VPN, which will bring the 
latest Wireguard with it iirc, but are those kern.log lines 
consistent with my complaint/report of slowness?

Thank you,

-- 
...a society must incorporate the rationalizing
power symbolized by scientific knowledge, for
otherwise it will be a fatally split society-
split between a powerful elite and the
disenfranchised mass. To this we add now: an
irrational elite is the most dangerous of all.

Holton, Gerald. 1985. On the Integrity of
Science: The Issues Since Bronowski. Leonardo
18 (4), Special Issue: Jacob Bronowski: A
Retrospective (1985): 229-232.

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Wireguard and my Buster kernel Bob Bernstein <poobah@ruptured-duck.com> - 2021-07-20 10:00 +0200
  Re: Wireguard and my Buster kernel Reco <recoverym4n@enotuniq.net> - 2021-07-20 11:10 +0200
    Re: Wireguard and my Buster kernel Bob Bernstein <poobah@ruptured-duck.com> - 2021-07-20 18:30 +0200
  Re: Wireguard and my Buster kernel Dan Ritter <dsr@randomstring.org> - 2021-07-20 12:40 +0200

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