Seconding this. UHD paint sequence renders can get murderous. Center/Crop Resize that ish down to 1080 or 720 even if you can swing it, and you’ll speed up your renders dramatically!
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@hBomb42 - this is another good use for openclip:
Render just the painted frames that you need as your openclip precomp,
because they temporally align with the rest of your sequence (is that a split inifitive, and do i care?)
Then you can destroy the paint node, recalling it if necessary by appending the openclip setup to whatever iteration of the batch that you’re in.
for example, you have 2,000 frames of 8k in your batch group, starting at frame 1001.
you make a simple precomp output.
you need to paint on frame 1011-1020, then you need to paint on frame 1301-1350, then you need to paint on frame 2051-2200.
You could carry an animation and context heavy paint node through all of your renders until the job is done (nightmare, memory hungry, error prone)
or you could render precomp_openclip_version2 (10 frames),version_3 (50 frames) and version_4 (150 frames) and throw away all the staging nodes.
it’s exactly like magic, until you realize that it’s still just work.
but openclip is the better way to ‘just work’
in my opinion of course.
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Or…I just click the little caching dot and take the render hit on the first render. Or if I’m feeling particularly hateful about it, I’ll right click->CreateBFX and render that.
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Ha, I was going to say don’t use this approach as I find it buggy and unreliable. It must have improved as I haven’t pressed that in over a decade!!
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It generally works for me, but is sometimes stupid about whether it wants to cache on render or not.
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@hBomb42 - it’s so funny - when you type that i physically shudder 
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For once, I agree with Alan, I love the MK! I tend to use it like a mini batch.
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Agree one hundred percent.
I always wished MK had the ability to add multiple inputs into paint
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Agreed