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Please see the official X‑Plane Support page for help.
First off, your MBP specs aren't that great which leads your laptop to work even harder. Laptops in general aren't great for XP unless you have a $2,000 machine.
Your computer is barely meeting the minimum specs which is not a good sign.
As for tweaks, there isn't much unless you put the graphics at the lowest or buy a new desktop or laptop.
Specs listed below via website
X-Plane 10 requires, at the minimum,
Note that the version of the X-Plane 10 flight simulator we sell here at X-Plane.com will run on Windows, Mac OS X, and Linux. If you’re interested, you can get more info on using X-Plane with a Mac.
For the best experience, we recommend the following system specs:
This site is no longer being actively maintained.