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I have serious concerns for devs that do not study,update, test but preach you:critical css w/out resource async is a waste not improvement
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My obligation is not to your product, and neither to an invoice. It's to the Web. And you fucking better learn to respect it. #webperf
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I can and will mentor and teach, just not if you are clueless AND boasting
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Deferring and using onload to trigger scripts requiring dependencies, in lack of AMD/CJS/webpack/rollup is an improvement: !render blocking!
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Lazyloading images IS an improvement to the UX: you can't vouch against it from your 100Gb network + drop megs of images far below the fold
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Replacing a responsive image with a picture you "copied" from elsewhere is not an improvement if you don't know what you are doing