THE RESULTS ON SAFARI ARE IN

I don't have the facility to test this myself, but OWC's Rocket Yard has tested and reported on the performance of Safari 11 and Safari Technology Preview compared to Chrome, Opera, and Firefox. Take a look at the Rocket Yard article for details but in general the ranking from fastest to slowest was:
  1. safari Technology Preview
  2. Safari 11
  3. Opera
  4. Chrome
  5. Firefox
With one exception, thruput, Firefox was a distant last and the two Safaris switched the lead back and forth. It is interesting the runners up, Opera and Chrome, are both based on a Webkit branch. It would appear the age of the Firefox engine is showing.

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If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein