If your web application has a page caching layer, you can prime the cache from within the Tugboat config file. This code snippet should get you started:
services: php: commands: build: # Warm the cache - 'wget -e robots=off --quiet --page-requisites --delete-after --header "Host: tugboat.qa" http://localhost || /bin/true'
localhost will cause Tugboat to load the front page of your application.
page-requisites loads all images,
delete-after removes the downloaded assets to preserve disk space.