Premiere Pro 23 lags when trimming in sequence

Just popping in to mention that this is happening for me as well, with 4K HDR footage on Adobe ProRes 422 HQ. Non-HDR 4K is not nearly as laggy after a trim. I'm already using a high-end Samsung NVMe M.2 SSD, so the read speed is far more than enough. Using Windows 10 and the latest Premiere Pro. I suppose PP is still not yet fully optimized for high bitrate source footage.

Edit: It seems that this strictly affects trimming, so as long as you use some workarounds, you can save a little bit of time in your workflow. For example, you can use the Razor to cut out the parts you don't need, and then drag and drop video shots to cover them. This doesn't force PP to have to buffer/render the sequence again, thus avoiding the lag. Sure, this will create some gaps in your sequence, but doing one trim as opposed to dozens only requires you to experience the lag once. And you can use Shift to select multiple gaps to trim all at once. Overall, you save a lot of time this way for a few extra steps.

Hello, I have the exact same problem : it lags severely (2 - 3 seconds) when I grab the head or tail of a clip to extend/shorten it. I use the latest version (23.4) at this date, and this makes editing basically impossible...

I tried to delete third party pluggins. I had two appearing in the Mercury Transmit parameter tab :

     - NDI somthing (a software that I used to create virtual audio/video inputs and outputs in OBS https://obsproject.com/forum/resources/obs-ndi-newtek-ndi%E2%84%A2-integration-into-obs-studio.528/

     - "Blackmagic Playback" (found as "BMDTransmit.prm" in the ".../Common/Plug-ins/7.0/MediaCore" folder)

Deleting those didn't work for me, I'm still seeking for a solution. I hope this helps finding the bug.

I have similar lag problem while trimming or moving in sequence. Macbook Pro M1, 16gb RAM. The problem exist in both 23.6 and 24.0 versions. I have no plugins installed, project - 1920x1080 with both full Hd and 4k media (mp4, h.264). The lag is more pronounced when there are subtitles in sequence (at least looks like it). Playback or scrubbing is fine, no problems. Any solutions?

Here's more info on ScopeLink: https://docs.hedge.video/scopebox/using-scopelink/installation-and-configuration

Ah! There is something there called ScopeLink. I vaguely remember installing something like that. I definitely don't use it. How can I uninstall it?

Confirming: There are no 3rd party Transmit plug-ins available/enabled, in Prefs --> Playback?

@Kevin-Monahan Any idea what might cause this given no plugins/extensions are installed?

@Kevin-Monahan, I was able to get everything running smoothly if I start PP while holding a modifier key and then disabling 3rd party plugins. Weirdly, if I uninstall all my extensions, the lag still happens. It only runs smoothly when that box is checked. So now I'm wondering if there are plugins or extensions living somewhere else that I'm not aware of. Do you have more info about what checking that box actually does?

Hey Tony, 

Thanks for hangin' in there with me. I was able to grab a few sample clips, but I could not reproduce the bug. Have you tried any basic troubleshooting, like deleting all media cache (it's necessary to close all projects, then delete all media cache from media cache prefs dialog box - 2nd option) and/or resetting preferences? Let me know.

Otherwise, you can duplicate your project, upload that copy, and I'll send it along to the Premiere Pro engineering team.

Weirdly, I cannot reproduce the issue according to the steps you outlined and the move you showed us. I am so sorry this is happening to you. Let's keep trying to nail this down. 

Thanks,
Kevin