Timeline/performance problems since 25.2.0 Build 50

Any updates regarding this? I feel that I have provided a lot of info regarding where the delays come from.

On Build 55 right now, problem still persists.

It's even worse than I thought. First I thought it was just a Lumetri triggering this, but I just added a simple text layed over the whole timeline, and that, too makes Premiere reload all files (I assume) again. Network traffic for about a minute before the program monitor shows any updates again. The delay also happens again if you undo changes to that layer. None of that activity is cached, and I'm on 128GB of RAM.

Same issue here as well. I'm using Macbook Pro M1 MAX and MacOS 15.

Same issues as @Christian Leibig here! Rolled back to 25.1 beta version!

I had to revert back to using 25.1. It was unworkable with that constant delay. It's funny because for some reason I had forgotten I updated so I wasted quite a bit of time trying to decipher including deleting everything off my cache drive.

I have done some more testing and found a difference in behavior between 25.1 and 25.2 that causes the delays (still haven't found the cause of the GUI issues, which come and go).

Setup:

Timeline is a very light 3 minute edit of h264 10bit footage using ProRes proxies. Above all I have an adjustment layer with Lumetri for some global corections. Now the difference is when I change anything in that global layer.

In 25.1:
Any changes to Lumetri are fine, and Premiere keeps working as expected. No extra reads or traffic on the network.

In 25.2:

Once I change anything in Lumetri in that global layer, rendering any output to the program monitor hangs, as does rendering previews. While this is going on I can see Premiere generating 300-400Mbps of traffic over the network to the NAS. The NAS is on a 10GBit connection and is normally not the bottleneck, it can go much faster. This traffic goes on for about a minute, after which everything goes back to normal.

My best guess is that touching the global layer causes Premiere to read/touch all underlaying files to update something color related. Possibly also sending off every file to the GPU to be processed.

TL;DR:
When making global changes 25.1 is quick and 25.2 causes a lot of read activity, preventing any work being done until every file has been read/processed.

Most of the problems vanish when I disable "Color Manage Auto Detected Log and Raw Media". Especially the delay until rendering starts is gone.

Since I loaded the project in 25.1 and then back in 25.2 it seems the GUI problems on startup have vanished. Clicking on clips now updates the Effect Controls panel again. But the delays are all still present. It seems everytime Premiere needs to process a file it takes ~60s before it actually does something.

In this timeline we're mostly talking about 10-bit h264 files with ProRes Proxies.