I have a Macbook Air (early 2015) 1.6 GHz i5, Intel HD 6000 graphics. On absolutely minimum settings, the game runs in the low 20’s fps. You can turn up some settings and run it looking good at around 19 fps. Either way you will hit fps spikes down to about 12.
The game would probably run a little better on bootcamp, but it would also cripple my tiny ssd.
That’s the bad news. The good news is that the game actually plays pretty well at those numbers. It sounds like it would be a slideshow, but it’s really not, and fun for the casual gaming that GW2 allows.