Hi,
First off: BETA, it ain't optimized for FPS (I get 23 FPS still-see my specs below).
Second: Do not max out the graphics (you'll get terrible FPS) since XP is meant to be future proofed-in a couple of years max it out :)
Third: Macs aren't great for XP since cooling become a big issue-poor specs for a outrageous price
Your GPU is slowing you down considering that it only has 2 gb of VRAM. Recommended is 4 or more. If you got a 1080Ti or Titan, yeah you'll get good FPS. Processor is fine since it's at 4 ghz (what model- I'm curious since I like PC's :)
My Specs
I7
[email protected] ghz
Nvidia GTX 970 SSC ACX 2.0 with 4 gb VRAM
Samsung 850 Evo 256 gb SSD which XP is on
16 gb RAM
2x 4gb Corsair Vegeance
2x 4gb Crucial Ballastix (butchered that name lol)
650 watt PSU
Like I said I get 23 FPS average ;)
-Rishi