Time for an Upgrade?

Hey fellow flight simmers,

I'm wondering if it is time for me to upgrade from my crappy old laptop to a newer one, or even possibly a PC. Money is pretty tight, so it would have to be cheaper. Currently, I run fsx, flying with the PMDG 737-800, and the Majestic Dash-8.

My current laptops stats:

laptop is About 7 or 8 years old

Toshiba

4 GB RAM

Intel i3 @ 2.4GHZ

500GB SSD

Windows 7

PMDG 737 framerates

When around the airport, I get about 5FPS.

When airborne, I get about 10-15FPS 

(In the virtual cockpit)

Majestic Dash-8

When around the airport, 10-15FPS.

When airborne, 25-35FPS.

(In the virtual cockpit)

The problem is, I fly the 737 way more often, and its frame rates are getting way too sluggish for me. I'm very impressed with the Dash 8 though. I would also like more addons, such as ASN and some airport scenery addons, but my computer has made it obvious I just can't do that. 

My graphics settings are at a bare minimum, so much the simulator looks horrible. I don't have any traffic AI on, but I will occasionally fly on Vatsim.

So even though the answer seems obvious, should I get a new computer or not? If no, are there any tweaks that could possibly improve my performance. 

Hopefully someone can help me out!!

Thanks, Ethan