Lovelace is very sluggish

Hi all,
I’m facing some strange behavior with the gui
Independent of which system I’m using. Either on iOS or my Windows System. The first start of Homeassistant or a reload takes a while till everything is visible. Sometime it shows first that the custom card is not available. It happens with all custom cards.

ee9f6e3117bb5d5a4d85716e244124d4a42fa257_2_230x500

My Setup

System Health

version 2021.1.1
installation_type Home Assistant Supervised
dev false
hassio true
docker true
virtualenv false
python_version 3.8.7
os_name Linux
os_version 5.4.83-v7+
arch armv7l
timezone Europe/Berlin
Home Assistant Community Store
GitHub API ok
Github API Calls Remaining 5000
Installed Version 1.9.0
Stage running
Available Repositories 719
Installed Repositories 21
Hass.io
host_os Raspbian GNU/Linux 10 (buster)
update_channel stable
supervisor_version 2020.12.7
docker_version 20.10.2
disk_total 109.5 GB
disk_used 14.1 GB
healthy true
supported failed to load: Unsupported
supervisor_api ok
version_api ok
installed_addons Glances (0.9.1), InfluxDB (3.7.9), Grafana (5.3.6), Check Home Assistant configuration (3.6.0), File editor (5.2.0), Duck DNS (1.12.4), MariaDB (2.2.1), Nginx Proxy Manager (0.8.2), Samba share (9.3.0), WireGuard (0.4.0), Samba Backup (4.3)
Lovelace
dashboards 8
mode yaml
views 7
resources 12