Hi,
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Make sure that you minified CSS. There are many tools to help you with minification during development. You can also use a plugin, such as WP Rocket. Contact support of your cache plugin to get assistance.
About this – https://prnt.sc/udjc59 , replace these images by images in mentioned by GTM size.
Optimize images – https://prnt.sc/udjf07 https://tinypng.com/
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