AMD Radeon R9 200 Series Graphics card, 32-gb GDDR5 RAM, Intel(R) Core(TM) i7-4790K CPU @ 4.00 GHz, on 256 GB SSD with 64 bit Windows 10. Connected via Ethernet cable with speed 100 Mbps (although the fastest I've seen PoTC update files is about 500 kb/s, it took about 2 mins to download a 500 Mb file from AMD's website)
Playing in full-screen with graphics on high and resolution at 1920x1080 I get a stable 100 FPS at the title screen, during loading screens drops momentarily to 10 FPS or lower. Around other players, attacking enemies and when an area is loading I average about 30 FPS (with random lags around 20 FPS and jumps to 40 FPS) and if by myself and not fighting get a solid 50 FPS.