Windows Precision Touchpads (aka Why are Windows touchpads still so crap?)
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Sadly, pretty much every single Windows external touchpad is complete crap. This is because they don’t support so-called ‘Windows Precision Touchpad’ drivers. This includes standalone touchpads, as well as touchpads integrated into external keyboards: they are all garbage. I think the new Corsair K83 might be an exception, although I haven't tested it yet. However, an interesting option I recently stumbled across is to use a Mac touchpad (specifically, a wired Magic Trackpad 2), in combination with this driver: https://github.com/imbushuo/mac-precision-touchpad