What route? Or is this all routes? You didn't say what the video card is in your new PC, this is a big factor, along with the CPU, RAM and hard drive speed.
To compare, my rig:
Phenom II 940 quad @ 3.2Ghz
4Gb 1066Mhz RAM
EVGA GTX470 Super Clocked video card
2x500Gb hard drives in RAID 0
Win 7 Ultimate 64 bit
I get frame rates all the way from 60 to less than 10. It's totally bonkers. I seem to get better frames on free third party routes than the routes I paid $$$ for!
Running RW with TSX on, graphics on high (both from the launch screen, and in game) HSC isn't bad, Donner is pretty good, GWML kills me.
*sigh* I meant WCML. not sure where I got GWML from.
