Is it just me, but having run my website through Google’s page speed insights, it seems ironic that I’m being recommended to optimise Google’s own resources.
I had another site that Google insisted on passing through another website. I forget what it was googlemobile or something which stripped out what it considered unnecessary. As it’s a card reading site it stripped out the most important part! I managed to bypass its interference.
As you said in another post, Google should stick to search.