Photoshop CC can't seem to handle complex/high poly count 3D Models. Will this be addressed?

Question

Hello all,
I am running Photoshop CC on 3 systems and having the relatively same problems on all. The source files are exported from ZBrush- .stl or .obj files that are complex and have high poly counts. The file sizes are into the hundreds of megabytes.  These are not the simple files like they show when people are using the 3D features- a racecar or simple toy rocket.
Photoshop CC doesn't seem to be able to open all the files and even when it does, the structures facings or facets don't always appear correct. I've developed a partial workaround, by merging the objects and reducing the poly count (which creates a new set of problems).
If I do get a file open, my ultimate goal is to be able to color it, add light it and render it for 2d print purposes. Again Photoshop seems to be picky- When I apply color via the airbrush tool, it usually isn't smooth. It seems to apply color by facet or facing. Same thing when I try to manually add in texture from another source file. It appears to make the detail jagged and blurry from the source file.
The appeal of using Photoshop for this process is we have people here who can do it without too much of a learning curve. Otherwise everyone else has to learn ZBrush just to color and light the models.
I've pretty much done all the troubleshooting I can and exhausted all the tools at hand. I have tried both texture painting and projections painting and all the other options. I believe the meshes are just too complicated. And if there is something incorrect in the file, such as a reversed normal, Photoshop doesn't seem to know how to deal with it. My systems have more than enough to handle the files.
Does anyone have any similar issues and is Adobe working on them in the form of a new release?
Thanks!

Answer 1

Hi Everyone. Thank you for writing back. I have two 2011 imacs running intel 2.93 ghz, one with 20gb or ram and one with 16gb, both have 1tb hard drives, 1gb vram, one running os 10.6 the other 10.9. I have a 3rd computer, a PC  that notably handles the files more quickly, but still crashes if it doesn't like something from the original 3d model. This one has a 3.7ghz intel quadcore processor, 24gb of ram, 3tb hard drive, and a 4gb nvidia geforce video card, running Windows 8.1.
So the reason I make the statement about Photoshop and not about my computers, is that all the above computers can handle the original files in zbrush. All the above computers can handle the files in meshlab. With ease. But when I get to photoshop, I face long load times, crashing, and a lag using the tools within the 3d space. And sometimes it handles the models differently than it does in any other 3d program. It seems picky for lack of a better word.
When I say high poly count, I mean 4 million to 8 million. I am able to knock down the poly count in meshlab and that can help. But sometimes the files just don't want to open in Photoshop. 
With all that said, it may be in something how some of the models were built, but again, Photoshop is the only one having an issue. And I have to add that I have been using Photoshop for 20 years and I absolutely love it. I am trying to make a case for my company to use it for coloring, lighting, and processing 3d models, but I just can't with the above issues.
Any help would be greatly appreciated.
Chris, if you need files, I can see about getting them to you. The only real issue is the work is highly proprietary and kept under wraps. So I would need to get approval and feel comfortable that is will be protected. Thanks!