Latest 2020 Update results choppy playback
Since I updated the latest version, playback has been very choppy even for a 1080p footage and timeline. I'm using a 8 core i9 9900k CPU with 64GB RAM.
I have never faced this issues even with 4k footages for a 2 hours feature film timeline editing. It's very frustrating that Adobe did not provide 'Save As' to previous versions to at least be able to open the projects and 2019 or other previous versions.
In addition, the Lumetri Colour panels are also showing errors 'AEFilter:14' very frequently. I have never run to such issues. I am not experiencing this issues in the 2019 version.
Please do resolve this issues asap as it will be extremely a productivity killer for most of the content creators.

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G. Smith commented
PP 2020 is simply awful. I have a new project, 1080p, three clips (all image sequences). It won't play even a single clip - no audio, no transitions, no color correction/grading, no effects. Just a 5 second sequence of either TIFF or JPEG images. My workstation is a Core i9 7900, 64GB, 1x 2080ti, 1x 2070. PP 2019 was 100% real time, full quality, with effects, cc, transitions.
I've tried rendering the image sequence in Media Encoder to AVID/Sony/ProRes/Cineform with no improvement in PP2020 performance.
I installed the latest Studio drivers from 2/1/2020 and had zero improvement.
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Aleck Morton commented
Playback just randomly drops audio out, or changes the volume on playback but nothing has been changed on the clip itself. Playback is laggy too. Horrible update, please fix asap it's unusable with clients.
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Lisa Halbert commented
I've found that the jittery playback when moving a project from 2019 to 2020 is specific to proxies for me. I had a similar issue moving projects from 2019 to 2018, but in that case, the issue was just really slow performance. In both cases, the solution for me was to create new proxies. I tested both the deletion and recreation, as well as just selecting 'Create Proxies' and have it create new ones. Both approaches solved the issue for me. I maintain a single annual project for all of my annual videos that I may (which turns out to be about 40 music videos and one big annual video each year), and I make a point of updating those projects each year to keep them up to date and able to be edited further if necessary.
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Hendrik Mägar commented
I have similar issue after updating to CC 2020. Totally new project, 1080p proxy footage.
Whole project start to lagg even the browser window: for exmple perfoming a "reveal in browser" from timeline to bin.
At the same time no shadow visualization on timeline when moving clips with a mouse. -
Kevin Monahan commented
It sounds like you updated a project containing a "2 hour timeline" from CC 2019 to CC 2020. Did you? Complex projects can become corrupt when updating the project file type from one major version to the next.
The advice most editors give is to remain on the project file type you began the project with (like CC 2019). The more updates you drive through a complex project, the more likely it can become corrupt. At this point, either return to CC 2019 or create a new CC 2020 project and import the legacy project into it.