Dashboards Slow and laggy since 2025.6.0(1)

[jupppo]

The problem

Since the update to the 6.0 and also 6.1 my dashboards are very laggy, sometimes displaying a value is also empty.
Most of the time I have to wait up to 30sec until graphs are displayed.
CPU and Memory Usage seems OK.
When I do a fresh restart, it is OK for a while, but after some time it lags again

What version of Home Assistant Core has the issue?

2025.6.1

What was the last working version of Home Assistant Core?

2025.5.X

What type of installation are you running?

Home Assistant OS

Integration causing the issue

No response

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response

[nocusham]

can confirm the issue.
every page that has a history graph causes 40% cpu load for me and takes forever to display the graph

[jupppo]

Yes, right. I checked while redering the graphs. CPU peaks above 80% sometimes

[DejanBukovec]

I can confirm same issue... Pages which have multiple mini-graph-card with 24h history do not load...

[jupppo]

Changed the title since it seems to afffect dashboard with graphs only. Thinking about reverting back, cause its really annoying

[krithur]

For me it seems to occur on dashboards with apexcharts cards.

[jupppo]

on Apex as well, but mainly on the HA standards

[houthacker]

Same here with 24hr history graphs. Also the Energy Dashboard sometimes doesn't load or at least loads very slowly.

[jupppo]

seems to be that it is not a rendering issue, rather than db query performance

[Warren2006]

I have noticed the same issue.

[jupppo]

I am really not getting any further with that. Most of my dashboards are practically unusable. I added Ram and CPU Power to the virtual machine running HA. CPU Load and Memory load is lower, but it has no effect on the loading times of the dashboard.
The only hint I get so far is this warning in the logs:
Logger: homeassistant.components.recorder.util
Quelle: components/recorder/util.py:292
Integration: Recorder (Dokumentation, Probleme)
Erstmals aufgetreten: 15:13:56 (1 Vorkommnis)
Zuletzt protokolliert: 15:13:56

The system could not validate that the sqlite3 database at //config/home-assistant_v2.db was shutdown cleanly

[erkr]

+1
Mainly history card doesn't load recent values when opening. Those load after a while (next sensor update?!)
I also use the history Explorer card. That one load normally

[DejanBukovec]

It is not related to database...
I use MySQL and is same thing...
Adding CPU do not help because looks like only one core is used... Same thing I saw when Im restore backup that only one core has been used... But this is maybe related to "unsupported" version of installation(VM+Supervised installation)...