Jittery editing in Rush / High CPU usage (desktop)

[webdbbt]

I'm new to Rush. When editing a set of 4K 30fps clips on my desktop I constantly get jittery / frozen playback when editing. I've noticed that this happens only during high CPU usage.  Jumping forwards, backwards and rewinding triggers the high CPU usage. Even stepping forward/backwards frame by frame several times will trigger high CPU.  If I wait until the CPU usage drops to zero, I can make a few edits before high CPU starts again.  But there is a lot of waiting. Exported video playback is just fine.

The only suggestion I've seen here is to set preview quality to low which I've done.

I'm using a Windows 10 desktop. It's a powerful computer: Intel Xeon, dual-processor,  6 physical cores per CPU, hyperthreading, so 24 logical processors. Quad channel memory.  I have a decent but not super-powerful graphics card. Rush does not seem to make any use of the graphics card, and uses less than half of the PC's RAM.

I know 4K is demanding, but I don't see how it would be possible to edit at all on a phone, tablet or slower PC. Am I missing something?

[Kartika Rawat]

Hi there!

Thank you for reaching out. I understand that you're having trouble with the playback in Premiere Rush.

• Which version of Premiere Rush are you using? https://community.adobe.com/t5/premiere-rush/finding-the-premiere-rush-version-number/m-p/4788185
• What's the source of media files?
• Could you confirm if your project is synced with the Creative Cloud?

Let us know, we're here to help.

Thanks,

Kartika

[webdbbt]

Kartika,

The info you requested:

Rush version 1.2.12 (Build 10)

Six MP4 clips; 4K @ 30 fps; length of 2 to 5 minutes each; total size 16 GB

Was not sync'd to cloud; but just turned on sync

The clips are visually very dense; I'll look at some other media to see if it has the same issues.

Other info:

GPU is an AMD R9 390 with 8GB VRAM. It is not being used by Rush.

Updated to latest AMD drivers today after posting this topic; same jitter problem.

I'm surprised the GPU is not listed as supported, the same chipset (mobile version) looks to be supported on Mac.