I see more and more people having issues with Node-Webkit.
Roger Wang is its dev and he is quite aware of the issues, he has received lots of feedback and is actively working on it almost everyday as you can see in the latest live builds page here https://github.com/rogerwang/node-webkit / http://dl.node-webkit.org/live-build/
I say he's actively working on it because I have been in contact with him very recently regarding performances, along with some other C2 users, and I also noticed a few days ago the appearance of a file that wasn't in older versions of NW: d3dcompiler_46.dll
I'm no expert with DLLS but I know this file is related to DirectX, graphics acceleration and it's one of the latest version of it since the current file most used is d3dcompiler_43.dll (If you check your System32 folder you're likely to find lots of (older) versions of it).
Ashley mentionned once that it cannot just be bundled like that for legal reasons and must be distributed throught the official dxwebsetup (directX) installer, but this means Roger is working on the optimization of how graphics are handled through Node-Webkit.
So let's have faith and be a little patient.