Why Is A Ski Fast?

OK, maybe a dumb question. I now own three pairs of skis, one pair new
two weeks ago. Soooo, same skier, same boots, same poles, same ski
mountain, same runs, same snow conditions, etc. Why are the new skis
faster? What I mean is that even though I feel that I am skiing the
same way, the new skis seem to be much faster than either of the old
skis. Actually more than "seem", they ARE faster. So much faster that
I have to make a conscious effort to go slower and stay in my comfort
zone. The only explanation I can come up with is that the new skis are
skidding less than the old skis.

I would appreciate comments, jimbo