Pw's game engine is completely CPU run. You could have a GTX 780Ti /R290X Graphics card.. Then still have the same looking game as someone with a $15 GPU
I used to have an i3 CPU, with horrdendous FPS. Now having a top-tier i7 and having 30-40 FPS in mass PK, is still terrible.
I can play DayZ or Arma III which are 100x more stressful on my computer and have FPS in the 90's-100's
PW is a very, very old game engine, they did NOT upgrade the engine for the new patch they advertised the game as "PW2" because its "new and reinvented" class design/way to get skills, ect.