I have a series of on-page error message within the google search console, here is an example error messages.
wp-content/themes/generatepress/css/unsemantic-grid.min.css?ver=2.4.1 was preloaded using link preload but not used within a few seconds from the window’s load event. Please make sure it has an appropriate as value and it is preloaded intentionally.
the Theme does not preload anything by default, which means either a custom function or a plugin is changing the links calling the various styles/scripts/fonts etc. to preload.