I'm not sure everyone quite understands just how much faster "1.5X faster" is.
That being said, I've lost faith in Adobe's ability to release coherent, stable, and useful software years ago — primarily due to the shocking mess that is InDesign. I love ID, and I use it all day, every day. But the amount of bugs and oversights it adds with every update is only rivaled by the lack of useful new features. It is by-far the most crash-prone app I've had in over a decade. In fact, if you asked me what the second-most crash-prone app I have is, I couldn't tell you... other than it's probably another Adobe app like Illustrator or Acrobat.
What's most amazing is that Photoshop, for the most part, is the oldest app Adobe offers and has (probably) the most legacy code and support of any of their apps, yet it is the only one that is fast, stable and rarely crashes/freezes for me despite the fact that the file sizes I deal with in PS are massive compared to any other app I've ever used.