BUG: Using a 4K monitor results in droping frames from RAM preview
I recently upgraded to a 4K monitor. Now RAM previews consistently do not play back real-time. Changing the resolution of the monitor to 1080p OR resizing the entire After Effects application window to a quarter screen results perfect playback. I've tested this on several other workstations that either have 1080p or 4K monitors and have been able to reproduce this. They all have different graphic cards and plenty of RAM. I've played around changing the MST settings on the display without any changes.
Tested on several versions of:
Windows 10 Pro
nVidia 1070's / 1080's
32 GB Ram
Latest nVidia drivers plus several previous versions tested.
Latest After Effects: 15.1.2 (Build 69)
The latest (November 2019) release of After Effects includes major improvements to our preview architecture. You should see reliable, real-time playback of cached frames.
Harry Winter commented
I have this issue too using a 2018 Macbook pro with a 4K Benq monitor. I've found a workaround is to change the Display Resolution to 'Default for display' in system preferences. Everything in the UI is massive now but at least I can play back in real time. And my AE is up to date (17.5.1)
Rolands Zilvinskis commented
This issue still has not been fixed. AE runs like trash on a 4K monitor once you have a somewhat heavy project open. Only way to kind of fix the issue is to enable DPI scaling override in compatibility settings, but that, of course, makes the UI blurry, so what is the point of having a 4K monitor then? It is absolutely bizarre that it is 2020 and 4K monitors have been around for years and Adobe still hasn't fixed this ****. I don't think they are even aware of it. What are we paying for?
Theodore Alexopoulos commented
This issue is not resolved. I'm having this problem with AE CC 2019 and 2020 on Windows with a 4K display. The only fix that works for me seems to be turning scaling off, but then the UI is so small it's unusable, so that's not a solution.
*Edit - Now I have had a chance to try this on a Mac Book Pro external to 4k display, and the same issue persists. The only way to get realtime playback is to set the scaling in Mac OS X to "Larger Text, Looks like 1920 x 1080" but that makes the UI way too huge and negates the benefits of having 4k! I have experienced this issue now on Windows and Mac while connecting to an external 4k display. Please look into this, it is very frustrating and is a basic function of your software that should work correctly.
Tabitha Moore commented
I'm having the same problems as everyone here. Running the latest version of AE on the latest 2019 MacBook Pro (top spec) and Dell 4K monitor.
When is this going to be fixed?
Claudio Sampaio commented
This is not solved at all.
Jonathan Benton commented
This is such a huge issue. Both Premiere Pro and After Effects run like garbage on a high-DPI display. On my iMac Pro, both have to be run with "Open in low resolution" turned on for both apps. This is the latest release, and every release prior. Like everyone else said, the only other option is to just shrink the window side down to 1/2 or 1/4 of its size. Ridiculous!
Chris Moss commented
This shouldn't be marked as resolved, the November 2019 release did nothing to resolve this issue. If anything, it seems to have made things worse.
Andreas Urra commented
The problem still exists in AE 2020. I just installed it and had a quick test with VideoCopilot Element 3D. The performance is directly dependent on the comp viewer size, not on the render resolution. I made a UHD comp and set the render resolution fixed to quater: When I make the comp viewer small (or the app window) it runs smooth as butter. When I make it large it becomes a slide show. This is frustrating.
128 GB RAM
NVIDIA RTX2080 TI
LG UHD Display
Rolands Zilvinskis commented
I've just installed the 2020 version of After Effects and I was hoping to see some performance improvements but I'm sad to say there are none. I'm using AE on a 4K monitor and on big projects the UI is still slow and sluggish and just completely unusable. And yes, I know, changing the DPI settings improves the performance, but it also makes the whole UI blurry and honestly who wants to have blurry UI on a 4K screen? The whole purpose of a 4K screen is to have a crisp, clear, beautiful picture in front of you.
Adobe is great when it comes to releasing new and fancy features, but when it comes to actual performance improvements they couldn't care less if I'm being honest.
Jonas Hofmann commented
The whole UI in AfterEffects and Premiere is rendered using one single CPU thread. Which is not enough on high DPI monitors. Once that core is fully used, it throttles everything down, even the playback. I happen to work on a i9-9900K, so it could be worse. I'm looking forward to GPU-accelerated UI rendering or at least multi-core supported UI rendering in the CC 2020 update. Thanks in advance!
steven silcox commented
I'm having the same issue. I've resorted to using the 'hack' described below which gives a After Effects a blurry UI. Very disappointing.
Darren Manden commented
Until a fix is in place, a really good workaround for this is to:
1) Find AfterFX.exe (usually somewhere like "C:\Program Files\Adobe\Adobe After Effects CC [whatever]\Support Files\").
2) Right-click, and open up its Properties.
3) Click on the Compatibility tab
4) Click on "Change high DPI settings".
5) In the new dialog box, tick "Override high DPI scaling behaviour".
6) Change "Scaling performed by:" to System.
7) Hit OK, and Apply.
Now, load up AE, and all of a sudden you have proper playback. The UI doesn't look as crisp anymore, but that's all. In terms of being able to do the job, or not do the job, it absolutely works in the interim.
Please Fix this!
Stéphane Augé commented
"Deactivate "Show cache indicators" too, that did it for me."
Not for me.
Color managment is of and the bug is still there.
Like Scott says, the only thing that do the trick is to minimize the main After effects window to about 70% of its full size or less. Like this the audio runs 100% ok when you do a ram preview.
Stéphane Augé commented
Hi this bug is known since CC 2015, AE CC 2014 don't have this bug and I still use 2014 for this reason. Adobe is aware of that issue and doesn't seem to care at all.
Carlos Albarrán commented
Deactivate "Show cache indicators" too, that did it for me.
Do you have color management on? Try turning it off. AE CM is terrible and it seems as you machine just can't keep up with CM conversion on a 4k screen :/