Your desktop or laptop has far more computing power, isn’t electrical power limited like a smartphone, has a lot more RAM, and should have a much much faster connection to the Internet.
I’m browsing the web on this five year old computer, and another computer almost twice as old as that, and it’s perfectly fast, and these weren’t supercomputers when they were new.
My suspicion is that there’s something badly wrong with your Lenovo — perhaps some malware that is on it?
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The concerns about AMP are simple enough — they tighten Google’s iron grip on the Internet, as the title of the article says. It penalizes small websites, who don’t have the personnel or the expertise to offer two separate versions of their site. It penalizes alternative browsers.