For those type of things, processor will probably be the least of your worries.
For google maps, maybe you need faster internet??
For application performance, try installing an SSD or increasing the RAM.
I upgraded my moms 2008 macbook to a 128i gig SSD and 8 gigs of Ram (she had 250 5,400 rpm HD and 2 gigs of ram) and now her laptop pretty much boots up instantly
