plymouth eats CPU

I often have the situation, that my Notebook get slow.

I identify /sbin/plymouth with htop.

I change /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="plymouth:debug"

and get following in journal

Okt 24 14:46:10 beelzemon plymouth[1098]: [./plymouth.c:1128]                                          main:daemon not running
Okt 24 14:46:10 beelzemon plymouth[1098]: [./plymouth.c:1139]                                          main:no need to wait
Okt 24 14:46:11 beelzemon lightdm[1128]: [./ply-boot-client.c:183]                       ply_boot_client_connect:could not connect to /org/freedesktop/plymouthd: Connection refused
Okt 24 14:46:11 beelzemon lightdm[1128]: [./plymouth.c:1128]                                          main:daemon not running
Okt 24 14:46:11 beelzemon lightdm[1128]: [./plymouth.c:1131]                                          main:ping failed

What is not working

sudo dpkg-reconfigure plymouth

or

sudo plymouth --quit
[./ply-boot-client.c:183]                       ply_boot_client_connect:could not connect to /org/freedesktop/plymouthd: Connection refused
[./ply-boot-client.c:184]                       ply_boot_client_connect:trying old fallback path /ply-boot-protocol
[./ply-boot-client.c:190]                       ply_boot_client_connect:could not connect to /ply-boot-protocol: Connection refused
[./plymouth.c:1128]                                          main:daemon not running
[./ply-boot-client.c:810]        ply_boot_client_detach_from_event_loop:detaching from event loop

It is annoying. I cannot deinstall it, because it will also removes lightdm.

found Bug without any solution or workaround.