The actual Retina Display resolution is 5120x2880px - if the Render manager is full screen it seems you´re looking at the actual pixel size - no?
Cheers
Frank
Same happens on my 5k iMac. I have a 1920 x 1080 secondary screen that I use to more easily get a larger preview. Same pixels, but they're packed in tighter on the HiDPI displays. That's why I wish we could zoom in and out on the render in the manager. I think I put a request in once on the wish list, but probably wouldn't hurt to add another one.
Ah - it´s the 21" variant. I was 27" expecting.The 4K display is 4096x2304,
4k will sooner or later be the new standard. So we actually have to render bigger (for websites there is the possibility to deliver different pictures variing in size for different resolutions where the browser decides which resolution it wants to load. It works more or less). Otherwise more and more people will see the actual pixels of your image.
Render times need to shrink A LOT.
They did over the years, very much so, not only because of better hardware but better software, too. And for a pic in this quality (I like it a lot, btw), 6,5 hours isn't much. I remember more than a decade ago, I bought a new computer (the older one was only two or three years old and high end). First thing I did after installation was a test with rendering a pic that hat taken more than an hour to render before. I expected the new one to be much faster but was astonished when the pic took only a few minutes. Todays advances in tech aren't that dramatic anymore, but just think about how long the same pic would have taken with your older computer.
It's just that our render times will stay as high as before because we have to deliver pictures with better resolution.
So what's wrong with rendering over night or do some other work on an older computer while your render machine is crunching through the render process?
(animations always took a lot of time. That didn't change.
Since I often "inherited" or bought on the cheap when the print shop I worked in retired their low-end, obsolete Macs I remember having my work Mac networked to four older machines running Bryce Lightning (a distributed rendering app that the primary machine would send image segments or single animation frames to chew on.) It wasn't that much faster on the old Macs, but it left the main station free to do more editing.