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Oh ffs, they're just fetching it to render a preview. Have you ever used WhatsApp?

Someone down at HQ is laughing their asses off right now.

Preview sure, but why every character?

Because the preview is displayed as you type, not when you hit Send

But still... why every character? Wait a couple hundred ms after each keystroke to see if they are done.

Because mobile internet is slow and that'd be the difference between 300ms and 600ms.

Because instant > wait a couple hundred ms

simple really