Haven't tested this with all classes, but this happens with my Blade Master + Dual Blade.
Bug:
After playing a few games, 3-4, the framerate gets really unstable, from 120 to as low as 30, it is unplayable.
The only fix is to leave arena and re-join, which is really inconvenient and makes me not want to play, especially when I forget and it affects the outcome of my matches.
This is an urgent bug, can you get it fixed finally?