Ahobaka wrote it right, though a lot of people made similiar posts in the past, when there wasn't even any nexus yet. For example, I play on XP SP3, P35-DS3R mobo, c2d E6750 (2x2,66ghz) and GTS250 (1GB DDR3), standard SATA2 HDD and 2GB's (oh god) of DDR2 RAM. PC built solely on Gigabyte parts. My results? I play maxed out in 1280x1024, AAx4/max AF - ~25 FPS everywhere. At nexus it's usually from 4 to 11 FPS. At bg's - constant 11-15FPS (sorry for that, guys - if I perform poor at BG's at times, it's because I'm having a hard time to even aim at my opponents, though at times I still land on first place). My GPU works on like 30% load all the time (even on max performance settings), while the CPU chokes like hell on 90% because of the f*king goddamn UI. When i turn it off, my framerate doubles and the game suddenly becomes playable everywhere (wow?). Bringing all the details to zero gives almost no performance boost for me (i get like 4-10fps more in most cases). The same goes with resolution. I can even try to get at Full HD and the framerate in my case goes down by mere 8-12fps.
I'd really like for the KR devs to get to work and patch the engine A S A P, cause it performs outright horrible and it terms of that, TERA is one of the worsly optimized 3d games I have ever seen. How long will we have to wait? How many times do we have to tell you, put the pics and prove, that the engine works bad and it needs fixing?