WordPress will try to load a number of additional requests, which in most cases are needed, such as emojis and dashicons. There is an easy to use a plugin called Speed Booster Pack, which can be installed on all connected child sites.
The settings can be enabled using the MainWP Bulk Settings Manager extension. You can use this key to save the settings in Speed Booster Pack to all child sites where it has been installed and activated.
After you have installed and activated the plugin, it will add a new admin menu called:
Speed Booster Pack
The general settings tab has a number of assets which WordPress core will load. These can be disabled, along with setting the autosave time, and the regularity of the Heartbeat API frequency.
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If you go to the advanced settings tab, a number of parts of HTML minification and CSS minification can be enabled. Remember to test these features. If the child site is running WooCommerce, then cart fragments can be disabled, which is a beta feature. This specific feature to disable cart fragments is also available in its own plugin if you did not want to use the Speed Booster Pack.
Other settings tabs in the Speed Booster Pack plugin cover include;
The Speed Booster Pack plugin is easy to use on your child site and will help improve your site load times by making a number of optimization changes to your site.