The performance of the base "escape edition" 2016 MBP has been suspect for me regarding its use with Lightroom. However, as a stand alone, I had zero issues (other than some touch pad 3 finger drag things) when using it during my work day for business. I normally have open and running Outlook, Xcel, Skype for Business, Safari (a few tabs) and maybe a Preview PDF for contact reviews, quotes, etc. No issues without a monitor, even when actively in a Skype video conference (which I do for about 2-3 hours per day). With the LG 4K this is what I have found today when all of the above are open AND a video Skype is in progress (about 25-35% of my day): (see screenshots for stats) The fans kick on, sounds like a jet ready for take off of an aircraft carrier, physically very hot. I do have the screen open but up on an aluminum platform that is designed for cooling as well. I had to plug in an external webcam with a mic as the comments I got re: audio were things like "is there a hurricane there?" and "wow, what's the noise?!" Moving anything on screen is jittery and sometimes hangs...moving a window takes a lot longer than it should. Brining up Outlook from a minimized state takes about 3-4 seconds and then you can't do anything with it for another 2-3 seconds. Then even deleting an item takes about 1-2 seconds. The video and audio both start to stutter (and the audio sometimes cuts out/gets choppy) Even typing in Safari or Outlook is very laggy...just hard to use. Bottomline: it's overworked and is pretty unusable. Based on this, I've come to the conclusion that this base 13" is NOT meant to be used with a 4k monitor for any meaningful work. I haven't dared try it with LR6 or any light video editing. It CAN handle the multitasking with just the internal monitor. Options: Ditch 4k monitors and/or upgrade to a 15" quad core, as I don't see that a higher spec'd 13" would make a ton of difference. Please chime in if you feel I'm incorrect about the 13's.