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Speedchecks have two definitons: (1) skiing up to a jump at full speed but stopping and not hitting it and (2) making small turns or snowplowing before going off a jump to shave off speed
(1) to check if you will have enough speed, to overcome the fear of rolling in to a big jump for the first time
(2) You can slow down a lot easier than speeding up. You should roll into a jump with a little extra speed and use a speed check to drop down to the right level.