After a Mac Pro Classic hardware overhaul to better support a 4K workflow, primarily in Premiere Pro, and after a couple of projects under my belt, I have been making some recurring observations… - “something” is contributing to the onset of sluggishness of various aspects of Premiere AND sometimes the over all Finder response. Things like… - Program Monitor goes BLACK while Premiere continues operate in other ways. - Movement of items in the editing time line, like dragging any audio, video or graphic element, can take up to about a sec from the time I click on an item, until I can start to reposition the item i=on the timeline. - Similar to the drag and drop delay, a delay in being able to grab and move an EFFECT item from the menu to something on the timeline or into the items effects editing window. - Sometimes I will get random noise pop up on the Program Monitor and it’s usually followed no long after by Premiere crashing to the desktop. - Every once in awhile, I will get a OS X crash, where all screens go black and the Mac Pro will initiate a restart. - When there is the type of sluggishness in Premiere mentioned above, there is generally a similar sluggishness in the OS when trying to operate within other programs or even launch other programs. In some cases, other programs which have a KEY, like Compressor, might launch and ask for re-activation. - I started a new 4K edit with a lot of PSD title elements and rasterized text. The project 1st started out with the PSD document being 10K x 6K pixels to better support the clients InDesign files. All of the above was brought on much more quickly. So I took the time to rework the InDesign -> PSD from the larger 10K/6K format to a 4K format, and while this delays the onset of the problems, it does not eliminate them. I also found, switching the main desktop 4K monitor from a 4K resolution to 2560x1440, also delays the problems. In some cases, when the problems get unbearable , simply restarting Premiere does the job. Sometimes I have to restart the Mac Pro. SO, I am curious if anyone else has had similar observations? If yes, have you found a cause and/or a solution? Is there a recommendation for the technical setup of a multi layers PSD file for use within a Premiere edit? A set up other than the typical RGB color configuration. Here are my specs… OSX 10.10.5 running on a Samsung EVO 850 500GB SSD - all other data on separate HDDs or SAS RAID0 volumes. Adobe CC 2015 (latest installs) GTX 980 Ti GPU 64GB System Ram (3) Desktop Monitors - Display Port -> ViewSony 2780VP 4K Monitor (2560x1440) - Display Port -> Dell U2711 (2560x1440) - Display Port -> Dell 2408WFP (1920x1200) - HDMI -> Sony HD Projector (1080P) Thanks in advance for any feedback or questions you might have on this post. Cheers RJ Miles Mactunes ….