to set up auto-archiving cron task so that Matomo calculates your reports periodically. When the cron is setup and the timeout value increased, Matomo dashboard will load very quickly as the reports will be pre-processed by the core:archive command triggered by cron.
If you do not setup the cron, Matomo will recalculate your statistics every time you visit a Matomo report, which will slow Matomo down and increase the load on your database.
Instructions for setting up auto-archiving can be found on the Matomo website at How to setup Matomo auto-archiving.
Updates, Recommended Server Configuration, and More
Check also the Matomo Installation, Update & Optimization do