SirSpunky
It is most likely the webgl issue. If the performance is high then canvas2d isn't being used. If performance is low then webgl is being used. Different browsers have decide differently whether or not to use webgl or canvas2d depending on your graphics card. Node-webkit tries to force webgl to be enabled which may differ from what chrome usually does.
In other news... A NEW RELEASE. Download on first post.
[change] New icon thanks to paradox.
[fix] Invalid colors would break "gradient fill" and "flood fill".
- The default behavior when using a invalid color is black is used.
[add] Added expressions to get individual components from colors: red,blue,green, alpha.
[fix] A typo fix and a few other fixes that I don't recall.