ive been playing tree of savior with the lowest of video settings, and can barely run it with 15 fps. there are some maps that i try to avoid because of weather efects, call it rain, sandstorms, even pollen-like glowing efects . i love this game so far, ive been playing for 4 days and already have a lv71 ranger, so i really wish you could lower the graphic demand a bit :D. also having an option to remove shadows would make this a lot better.
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have you tried tweaking the .xml file to increase FPS? 
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I have i3 4gb ram Radeon 6570 video card. All graphics enhancement are off. i am running an average of 60fps
drops to 40fps if there are many mobs but can instantly recover. 24 FPS on town.
Being able to turn off the weather effects in game would be nice.