Avchd is cpu intensive.
Intel i7 is preferred.
I agree with Ann.
PrE 9 also does not take advantage of a CUDA card, as it does not have MPE (the Mercury Playback Engine). One needs PrPro, CS5, or later to use CUDA and MPE.
AVCHD performance is greatly improved in versions 10 and 11. With versions 10 and 11, you can edit AVCHD on a dual-core processor with 4 gigs fo RAM.
You don't say what processor you're running, how much RAM you have or even what operating system you're running, so it's hard to give specific advice. Also note that laptops are built for portability, not performance, and often do not perform as well as similarly specked desktops.
You also don't say what project settings you selected when you set up your project. (You can but not change your Project Settings under the Edit menu.) Matching your project settings to your video is vital to optimal program performance.