Since Electron 1.2.0, that means since the update from Chrome 50 to Chrome 51, there no LCD-text-antialiasing anymore (tested only on Windows).

Here an animated GIF showing the difference (300% zoomed screenshots) - look at the 'To run...' text:

The text is now less sharp and slightly blurred...

NWJS has the same problem since updating to Chrome 51, but Chrome 51 itself is fine.

Due my own research it seems that the problem might be somehow related to some page/window background-color and/or transparency settings... (Chrome renders automatically with grayscale-antialiasing on transparent elements).