Hi,
Compare the specs of your Mac and XP recommended specs and you'll see why. Macs are NOT good for running XP since they have god awful specs and are overpriced. You literally need a new computer since yours will not run it. Laptops are generally bad BUT a fully flushed out gaming laptop like a Sager will run it perfectly. Macs also have bad cooling which is why XP will run poorly.
I plan on buying a Sager laptop in the summer with an :
I7
[email protected] ghz
WD 512 gb SSD
WD 512 gb SSD (yes 2)
Nvidia GTX 1070/1080 (haven't decided hopefully the 1080 ti gets added)
16/32 gb RAM (haven't decided)
This will end up costing me about $2500+
My current Desktop:
I7 4770k @ 3.5 ghz
EVGA GTX 970 4 gb VRAM ACX 2.0 SSC
Corsair Vengeance 16 gb RAM
MSI Z87 G41 Mobo
Samsung 850 Evo 256 gb SSD
Hyper 212 Evo CPU cooler
650 watt PSU
I get 30 FPS with medium settings
Hope this helps
-Rishi