Upgrading computer worth it?

I am currently running Zwift on a mid 2009 Mac Book Pro. Processor 2.66 GHz Intel Core 2 Duo, 4G, graphics NVIDIA GeForce 9600M GT 256 MB.


It works but the display is quite jittery. 


I was wondering if I got a new computer if I’ll see a noticeable improvement in performance? 

Intel Quad Core 8200 Processor @ 2.33hz
Core 2 Quad Q8200 2.33GHz is a high-end Processor based on the 45nm Core micro-architecture.
It offers 4 Physical Cores (4 Logical), clocked at 2.33GHz and 4MB of L2 Cache.
4GB DDR2 RAM (can be updated to 8GB(
Onboard Sound
Onboard Network + Network Cable
Freshly Installed Windows 7 64 Bit Professional (Activated)

NVIDIA ASUS GTX 650 Ti Graphics Card
Core Speed: 928 MHz
Architecture: Kepler GK106-220-A1
Memory: 1024 MB
Memory Speed: 1350 MHz
Memory Bus: 128 Bit
Memory Type: GDDR5
Memory Bandwidth: 86.4GB/sec
Texture Rate: 59 GTexel/s
Pixel Rate: 15 GPixel/s
Resolution (WxH): 4096x2160

I’m looking at a unit with the following specs, but don’t want to spend the $$ if I won’t notice much of a difference.

Cheers, Mark

The graphics card is the main thing. The GTX 650 is Zwifts ‘recommend’ setup so should run things fine. 

Yes you will see a huge difference in graphics, resolution, and in my case, gameplay.  I went from a MacBook pro to the Alienware Alpha and everything looks and works much better.  Good luck.