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One of the easiest things you can do to speed up your site is subset your custom fonts. This means getting rid of any characters you may or may not need to dramatically shrink the size of the file. Luckily, I made a very cool tool to make this easy to do with www.npmjs.com/package/glyp....

So often, we're embedding font files into our products that include math symbols, accents and other characters when all we need is uppercase, lowercase, punctuation and some numbers. This just means extra, unneeded stuff we're sending to users - which requires energy.