Dashboard display delay only on first access of the day

Good morning,

I am currently evaluating the Cachet 2.4 solution to display the status of an information system.
I encounter a bug in the dashboard display:
When the dashboard has not been accessed for several hours, there is systematically a delay of 2 minutes before it can be displayed.
I don't see any errors in the docker logs, I don't understand why this is happening.

The login form is displayed quickly if necessary and it is only after validation of the login that the "blocking" is felt.
Once these few minutes have passed, I regain full access to the dashboard.

This is all the more bizarre as the public HMI continues to work perfectly during this period of time.

Here is my configuration:

Docker compose
-postgres:12
-redis:latest
-postfix (custom container)
-stamp:2.4 (custom container)
environment:
- DB_DRIVER=pgsql
- DB_HOST=
- DB_PORT=5432
- DB_DATABASE=
- DB_USERNAME=
- DB_PASSWORD=
- DB_PREFIX=chq_
- APP_KEY=base64:
- APP_LOG=errorlog
- APP_ENV=${APP_ENV:-production}
- APP_DEBUG=false
- DEBUG=false
- SESSION_DIVER=redis
- CACHE_DRIVER=redis
- REDIS_HOST=
- MAIL_DRIVER=smtp
- MAIL_HOST=
- MAIL_PORT=25
- MAIL_ENCRYPTION=false
- PHP_MAX_CHILDREN=20
depends_on:
-
-
-

Thanks for your help