New Sony Vaio F series..?

I bought a Sony Vaio F series with i7 1.8ghz processor, nvidia 420m with 1gb, and 4 gb of ram. Full 1080p HD screen. ($1700) I was expecting a fast computer, why is it that it doesn't make much difference compared to my last laptop which had a 2.2ghz pentium and built in cheap intel graphics (costed 600$) Photoshop is laggier on this computer, and Sony Vegas doesn't run as fast as i hoped it would. Computer itself lags a few times with random programs i use, startups and such. Any help? Sorry for the quick post, sort of rushing it right now. I'm slightly worried since i just got this computer a couple weeks ago.