This may help a little I have tiny 8Gigs of RAM I use AP as follows.
I share Mac book pro with Skype user as in they can see my screen on their end. I share also at the same time share Mac book screen to my iPad Pro by cable using AP.
Then give a tutorial live to customer.
So its being IOS OX and AP are under pressure, any drawings I do live and the lag is none at my end.
Only difference here is the Mac book pro is 2015 model.
Other suggestion if your interested is a Wacom tablet large I may sell but I would not suggest using this with a lap top only on a bigger screen.