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in my case I see that 'platformer' behavior of enemies isn't 100% smooth and game can jerk, but I agree that old NW is working much better than Chrome
now I just found this post made by Chris:
"We also made a batch file to launch the game with node-webkit commands, this is clearly helping the frame rate:
--disable-threaded-compositing --ignore-gpu-blacklist --enable-zero-copy --disable-application-cache"