yea you accelerate faster if you get out of 1st quick and into 2nd where all those rev's take you some where. Found this out when doing a few 0-60 runs. i was a fair bit slower if i reved more in 1st and faster if i only reved to about 4.5-5k in 1st it was quicker.
The laws of physics suggest the opposite is the case. That because the gap between first and second gears is very wide on the Clio Sport you need to hold first to just before the rev limiter cuts in or when you go into second your revs will be too low.
There might be a reason that's not the case, but off the top of my head the only thing I can think of is what happens on some really powerful cars, that you get wheelspin when you go into 2nd and the traction control cuts your acceleration, so you're actually better off by short-shifting so it doesn't do that. But, my Clio hasn't got enough power to to do that.
I have to say though that I concluded at the drag strip that that might be the case in first. That you actually get a better time by driving it away from the start without any wheelspin than you do by picking up a few revs, dropping the throttle, and leaving it to the traction control to limit the wheelspin by cutting back the throttle.