(1.) I am having some issues.  I can get like 60fps in the Cessna 152 and other small props with everything on High and crazy real-world weather, thunderstorms, massive cloud formations and systems, etc.  No problem.  I can even pull about 40-50fps in Manhattan with all its buildings, etc.  But for some reason, I load up a 747 ANYWHERE on earth, at literally the lowest graphics settings possible including lower resolution (I tried it) and cant get more than 10-15 fps.  The heavy aircraft are not even playable in my opinion just due to the performance alone.  Anyone else having this issue?  I turned off everything to ridiculously low unplayable graphics and still get a slideshow.  
But flying at sunset over heavily populated areas with TrackIR, & massive clouds and buidlings it doesnt even hiccup in a C152.  Head turning and panning smooth as butter.  I'm not looking to crank everything up and fly the 747 but geez, 10fps at 1994 graphics settings??? 

GTX 1080
i7-6700k @ 4.5GHz
32GB RAM
500GB SSD
2000W PSU
Watercooled
Win10 2004

(2.)I am having a multiplayer issue when I group with my friend.  2 issues.  One is that if I am the host, we cant see each other.  Sometimes we will, then it will state that one of us has disconencted.  Or one of us will just dissappear and we cant see each other anymore while flying together.  The other issue is that neither of us can change customer weather while in multiplayer.  Why is this setup like that?  Even in FSX you could change the weather online with others.  We wanted to do serious cross wind landings at KISP.

(3.)Is there anyway to bring back the old 'spot plane' view from FSX and every other iteration of Flight Simulator?  So I can pan around the plane from the exterior with a hat switch?

BUMP

You can pan around the plane using the free look view.

1) There's a performance issue associated with all the glass instrumentation. There's a workaround that can help. Read this thread:

2) Can't help you.

3) Not quit, but you can sort of get there with the drone camera. If you 'lock' the controls you can get get the drone to orbit the aircraft. The external camera also orbits and you can use your right button + mouse move to position it at any point in space around the aircraft. 

Thanks for the tweak with the Glass Cockpit aircraft!  Helped a lot. Still having issues making custom weather while in multiplayer, even if I'm the host as well as our planes disappearing from each others view.  Fixed the camera issue too, turns out I don't really miss spot plane view that much and prefer the new views FS2020 has embedded in the sim.  They work pretty well.