Maintain speed whilst turning
When turning, hold down the D-Pad in the direction you want to turn in, and without removing it, move your thumb so that it's also pushing 'down' on the D-Pad. You'll appear to glide, in a way, around the turning, whilst maintain a speed similar to that which you reach when crouching.
You can't do this when utilising a sharp turn, though. It won't work, and you'll either just lose the speed anyway or not turn quickly and far enough, meaning you hit the wall or fall off the cliff.
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