Finaly I was able to get rid of the 30s delay.

TL;DR
1. Changed RESUME=UUID=... to RESUME=none in /etc/initramfs-tools/conf.d/resume 
(removing the file didn't help)
2. sudo update-initramfs -u

---
I've got a custom LVM layout.

$ cat /etc/lsb-release 
DISTRIB_ID=neon
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="KDE neon User Edition 5.15"

$ uname -r
4.15.0-45-generic

$ sudo apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.130ubuntu3.6
  Candidate: 0.130ubuntu3.6
...

$ sudo cat /etc/initramfs-tools/conf.d/resume 
RESUME=none

$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.15.0-45-generic

$

With "RESUME=UUID..." in /etc/initramfs-tools/conf.d/resume:
[    3.418544] Btrfs loaded, crc32c=crc32c-intel
[    3.487208] BTRFS: device fsid ... devid 1 transid 272021 
/dev/mapper/vg_00-lv_root
[   34.587759] BTRFS info (device dm-0): disk space caching is enabled


With "RESUME=none" in /etc/initramfs-tools/conf.d/resume:
[    3.422572] Btrfs loaded, crc32c=crc32c-intel
[    3.487216] BTRFS: device fsid ... devid 1 transid 272833 
/dev/mapper/vg_00-lv_root
[    3.501201] BTRFS info (device dm-0): disk space caching is enabled

Hope it  helps someone.

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https://bugs.launchpad.net/bugs/1768230

Title:
  Long time booting : Failed to connect to lvmetad. Falling back to
  device scanning.

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