Even though this discussion is based on an hypothesis, in reality El Cap is much slower than the promise and hype. I don't think anyone in heir right mind would install it on a PC. Apple has a long way to go because whatever El Cap can do Windows 10 can do equally as good or much better. Until Apple fixes this issue I'm finally going to use Windows for work and not just leisure time.
While Metal is not going to magically speed up every aspect of El Capitan, in some areas its quite an improvement. Adobe even mentioned Metal speeded up After Effects X8 faster.
Keep in mind applications still need to be changed to take advantage of Metal performance increase. So I don't know if your testing will be that accurate until that happens.
Here's another thought : Metal on the desktop isn't actually intended for our AMD/Nvidia GPUs but instead it's really to prepare developers for gradual transition to desktop iOS-ARM.
It could be its run off from porting Metal to the desktop from iOS (Just like AV-Foundation was ) While it could happen, I doubt so on the Mac Pro platform as it needs much more powerful components then ARM currently provides. Perhaps low powered Laptops perhaps.
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