What monitor are you using?
Dell UP3216Q (DP4k60)
There have been some issues with Dell 4k monitors (weird, I know).
Is there a Multi-Stream Transport (MST) option in your monitor settings? If so, try disabling it.
Disabling it works to get RAM previews running at a solid speed, so perhaps it'll help your issue too.
There is not. I have checked Dell documentation and there is not a MST option on this model.
Also wanted to revise original statement.
I can move the CTI down the timeline and there will be no screen redraw for 30 seconds up to a minute. Sometimes not at all.
That would frustrate me no end.
Does this happen in every project? Do you have footage in your project(s)?
Do you have any sort of preview hardware connected (AJA, Blackmagic, Kona, etc.)?
I do have HD footage and sequences rendered from C4D.
Will update Windows 10 over the next few days and see if that makes any difference.
No preview hardware connected.
What format and codec is the footage? And from what kind of camera?
What kind of image sequences are the renders?
Are these files on one of your SSDs or something else?
Do you see this behavior in comps that don't have any footage and are just shape layers/solids?
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If you're waiting minutes for a frame of a trivial comp, it sounds to me like you're enduring one of the internal timeouts in AE having to do with communications between AE's various processes.
In my experience, that points to an issue with a firewall setting or anti-virus.
It's easy enough to check: unplug your system from your network if you're paranoid like me, then turn off all firewalls and anti-virus software. Are your previews fast now? If so, turn things on one-by-one until you find what's causing the problem. If not, then it's something else and just ignore me.
H264, mostly HD with a few 4K clips, short. But slow re-render is universal.
Not certain about the camera. B-roll footage from Pond5.
All b-roll on SSD.
PNG sequences, no alpha. I am in the process of moving sequences to SSD, to see if that makes a difference.
Will try different file formats for sequences.
I am connected to a network, I will give that a try as well. Trying to wrap up some projects, then will delve deeper.
Did you ever get this issue resolved? Please let us know the status of your project or if we can assist at all.