RipkenFanSon used to say there is baseball speed, and there is track speed. He ran indoor track for three years and would always post his best yearly baseball showcase times in winter (during indoor track). Indoor track did teach him technique, which Michael Gupton really has a handle on. With speed being son's elite tool, we knew it was advantageous to run at enough third-party events (60 yd dashes)to get down to a "magical number". For a while he couldn't seem to get out of the 6'5s-6'6s. That changed when he ran the fastest of 223 Showball showcase prospects in front of schools of "mutual vetting." Weather, wind, timer/laser/hat drop, surface conditions really played a factor. In addition to asking his "time" I would usually probe as to where he stood among others. We also arranged for a HTF time at an event to add to his resume in baseball college recruiting.
MidAtlanticDad wanted a few trade (showcase) secrets. Here are a few (I learned) from RipkenFanSon. Run without your protective cup. He felt he was both more flexible and explosive. Most showcases has the 60 yd dash as the first event, so you can put it back on when you grab your mitt. The 60 (as in the video referenced) is often run in pairs. Son often talked with players in line (asking what their top 60 was) and tried to pair with the fastest runner.
As for the HTF times, again their is a big range in time based on methodology used. It should be bat to bag (sound to sound). And full swing, not half. Son's fastest times (in games) were typically 2-strike grounders to infield, so in showcases he'd have to envision that scenario of beating out an infield hit.