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What type of loop code on game engines? [duplicate]

Recently I worked on a game on Spritekit Engine. My question is not about spritekit, but generaly about game engines. When I write a loop code and run it (eg while i< 100000) my CPU usage goes to ...
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TTF fonts are being converted to image in CPU or GPU?

Once I use a TTF font, when they are being converted to images to be rendered? Does CPU or GPU do the conversion? How heavy is that operation?