Until now, implementing acceleration on OS X guests has proved difficult or impossible, presumably due to the way OS X handles graphics. Yesterday it was announced that Metal is coming to El Capitan. I wonder whether that will change the situation as regards the feasibility of acceleration for OS X guests in Fusion virtual machines. Anyone care to comment? More specifically, how realistic it would be to expect, say, a Snow Leopard Server virtual machine to have 3D acceleration under El Capitan in the foreseeable future?
If I understand it right (been a while since I chatted with the folks in the know), the issue is more with the guest OS than the host, so at best we might expect 10.11 guests to do better.