in preferences/privacy.
Turning off webgl significantly improves things with google maps. Note the apple maps app flies.
To eliminate having to change the WebGL setting just found this:
https://support.google.com/maps/answer/3031966?hl=en
Can run google maps in a mode that now runs very fast for me, and seems to have all normal functionality.
WebGL uses the GPU, which is pretty weak in the macbook.