The game's been tested on very old laptops and it had excellent performance. Have you tried switching to 30FPS? And also make sure you don't have plenty of browser windows open. Other Flash apps could be causing the lag.
It seems to be that hunters and paladins can sustain damage unlike other classes. My rogue dies a ton at level 40. Hopefully the classes can be balanced a bit better. Otherwise, great game.
resting after a few kills is not that bad, particularly if you have food(need to always have meat on rogues). The rate at which rogues level is fine imo, I just played one to level 85.
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The game's been tested on very old laptops and it had excellent performance. Have you tried switching to 30FPS? And also make sure you don't have plenty of browser windows open. Other Flash apps could be causing the lag.