ubuntu@foufoune:~$ lsb_release -rd
Description:    Ubuntu 17.10
Release:        17.10
ubuntu@foufoune:~$ apt-cache policy systemd
  Installed: 234-2ubuntu12.3
  Candidate: 234-2ubuntu12.3
  Version table:
 *** 234-2ubuntu12.3 500
        500 http://azure.archive.ubuntu.com/ubuntu artful-updates/main amd64 
        100 /var/lib/dpkg/status
     234-2ubuntu12.1 500
        500 http://security.ubuntu.com/ubuntu artful-security/main amd64 
     234-2ubuntu12 500
        500 http://azure.archive.ubuntu.com/ubuntu artful/main amd64 Packages

ubuntu@foufoune:~$ time ping  __cloud_init_expected_not_found
ping: __cloud_init_expected_not_found: Temporary failure in name resolution

real    0m15.016s
user    0m0.000s
sys     0m0.003s

After applying the workaround from comment #11, I see fast lookups

ubuntu@foufoune:~$ cat /etc/systemd/resolved.conf 
#  This file is part of systemd.
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
# See resolved.conf(5) for details


ubuntu@foufoune:~$ time ping  __cloud_init_expected_not_found
ping: __cloud_init_expected_not_found: Name or service not known

real    0m0.006s
user    0m0.000s
sys     0m0.001s

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  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

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