It's related to the page speed, when you using this tool: https://developers.google.com/speed/pagespeed/insights/ to check your page speed, you will see the above result which I attached earlier. the guidelines also there, visit google speed insight tool and get to know deeply.
Thanks for sharing this links and information here Katren, I will go through it , Once again Thanks
You're not going to master the rest of your life in one day. Don't stress. Master the day. Make this a daily reminder.
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