First of all you need sharp skis. without sharp skis you can carve in the snow and you start sliding everywhere. You can test your skis by scraping your finger nail on the edge. if a little part of your nail comes off after sliding down with the slightest pressure you can tell it is sharp. also waxing makes skis go faster and i have heard that rubbing soap on the bases of your skis makes them go super fast, (but it leaves bubble's.) I hope this answers your question!
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Nope it is the ability of the skier. Not the skis. But fiberglass skis are probably lighter. But i dont think they would preform as good as skis with a normal base.
Because it takes more space to turn and you also need speed to turn them. It is mainly the radius.
In general they are faster, however there are other factors that effect your speed while skiing. Also, at slow speeds longer skis are harder to control.