Installer checks for updates too often

The class WP_Installer contains the filter function plugins_upgrade_check for the filter pre_set_site_transient_update_plugins. This function calls refresh_repositories_data.

The installer settings include a value called last_repositories_update containing the last time the repositories were updated. One would expect that refresh_repositories_data would check this value and not query the repositories if the update data were still fresh. This is not the case, so for every invocation of the filter pre_set_site_transient_update_plugins the repositories are fetched. For me, this happens four times on most pages, so this makes the WordPress administration panel much slower than it should be.

And, load_repositories_list checks for the config settings repositories_exclude and repositories_include, but those can’t be set at that time, as load_repositories_list is called in the constructor and the config is loaded later.

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