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Re:Grd – A CSS grid framework using Flexbox in 512 bytes gzi... by Yaggo on Wednesday March 16, 2016 @04:55AM (#11295896)
It's actually worse on mobile, because mobile connections typically are not order of magnitude slower than non-mobile, but mobile cpu power can be order of magnitude more limited (esp. on lower end hardware).

https://timkadlec.com/2014/09/js-parse-and-execution-time/

Re:Grd – A CSS grid framework using Flexbox in 512 bytes gzi... by reitoei on Wednesday March 16, 2016 @05:16AM (#11295968)
That article is about JavaScript, not CSS.
Re:Grd – A CSS grid framework using Flexbox in 512 bytes gzi... by Yaggo on Wednesday March 16, 2016 @05:31AM (#11296026)
Does not matter, same principles apply to CSS as well. Transferring is pretty lightweight operation compared to parsing & rule applying.