Generate a bunch of thumbnails in advance to speed up the output of the Media BE module.
This process can take a lot of time. For the first time, prefer to run the CLI command:
cd {sitePath}; ./typo3/cli_dispatch.phpsh extbase thumbnail:generate # Available options: --limit --offset --configuration --verboseTip! You can also configure a Scheduler Task for that. {namespace v=Fab\Vidi\ViewHelpers}