According to test results on this thread using shells provided by @imaffett , Crosswalk 11 and 12 both have the same performance issue as crosswalk 10 or even worse, while crosswalk 7 is the best one to build with for now (45 to 60 fps).
Hope they fix new versions of Crosswalk to be even better than 7.
ugh.... thanks for the update man. One day, this all will work out well, maybe in C3 lol. Not to hate on you intel guys or anything. I know you guys are trying your best and only have so much to work with, not like there's many/any better options for mobile exports