I have enjoyed Adobe software since the very beginning. I was also an early Cloud customer, and have bet tested some Adobe applications. I am writing this out of frustration with two of your photography applications, Lightroom and Bridge.
To dispel user or hardware issues, let me say that I have made a living with this stuff for over thirty years. My current machine is a late 2015 iMac i7 Retina with 16Gb ram. No issues here.
The last several versions of Lightroom have been resource hogs. What happens is that, after about 30 minutes into a session, the fans come on and I can see my processor activity going off the charts. This slows down the entire system. Sometimes LR freezes up; sometimes it quits. Did it with my last iMac, and now with this one. This for a catalog with only a couple of hundred images.
When it doesn’t abruptly quit after a minute or two, I notice that the images viewed by hitting the spacebar are not in focus. I can use the mouse to go to 100% view and the mage snaps to focus, but then, back in fit view, it looses it. Very disturbing. This program is unstable.
Fortunately, I have no problems at all with Photoshop. So, until the next releases fix these performance issues, I have purchased PhotoMechanic, and will use it as the front end to my photography work. Not my preference, but it works.
Same here in Bridge. If I hit the spacebar the image is out of focus. If I just click on the image it focuses. Click again and it is unfocused. I don't use Bridge much as Lightroom 2015.4 is working a lot better than you experience so I use it all the time. Agree that Adobe needs to spend some programming time fixing things.