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I'm using Premiere Pro Beta, version 24.6.0 BETA (build 2), and encountering numerous issues with lagging and glitches in the Program Monitor. The glitches typically appear after 20 to 30 minutes of starting the software, rather than at the beginning. Additionally, after exporting from a rendered timeline, the result is full of glitches - please refer to the attached images.
My original footage is in 4K, and the project involves a significant number of effects, primarily Lumetri Colors. Furthermore, I have a film grain footage overlaying the entire timeline, which raises the question if this could be the issue for glitches in the export, however the gliteches appear in Program Monitor even when the track with footage is off.
I'm using a MacBook Pro (16-inch, 2019) with an 8-core Intel Core i9 processor and 32 GB of RAM, which should be sufficient for the task. I'm working on an external SSD hard drive with a USB 4 cable, formatted in APFS.
I've taken several steps to address the issue, including but the issues still presist
- creating proxies in H.264 QuickTime format
-regularly deleting cache files
-enabling Mercury Playback Engine GPU Acceleration
-designating 26GB of RAM for Premiere.
Any ideas what can be the issue?
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A small detail but still want to add : I put my playback on 1/4 and its still lagging !
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I guess I have the same problem started like 3 months ago. I have tried to reset the system of my MacBook, I have tried to reset also Premiere and also to take Premiere 1 previous version but nothing change. Still have the problem. Right now I'm using my old laptop 6 years old and works as fast as my macbook
  
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Did you resolve?
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Not sure to be honest, I did bring my laptop to apple store for basic cleaning, there was a lot of dust which was causeing overheating, which might have been the problem. is your laptop's fans go crazy as well even when its not doing anything heavy?