I've posted this as a comment in another bug, but thought it would be best, to open a seperate issue. My Problem is the Following: Since the Update to 13.3, applying presets to an unedited picture in the develop tab randomly does not affect the custom curve saved within that preset. Also the preset is not shown as applied, so I can't change the intensity of the preset. When I change to another picture and then back to the one I applied the preset to, the correct curve is shown, but has no effect on the image. I need to manually change the curve a little bit, and wooosh it's applied. Another option is to apply a different preset and then switch back to the one, I wanted to apply in the first place. I have had performance issues (RAM leaking, slow downs etc) for years and it's annoying, but at least I can get rid of those by restarting every 30 or so minutes. But this just slows me down so much it's painfull. For reference, I've attached 2 Screenshots. This right here is how the picture and the UI looks after applying a preset: As you can see, color changes ETC are applied, but the Curves are not affected and the "Amoiunt" Slider is grayed out, even thou the preset was applied. Next I applied another preset and then this preset again. This is how it looks: As you can see, now the Curves where applied correctly and the amount slider is back. This is how it always was and how it's supposed to be. It doesn't always happen, but it does happen in like 70-80% of cases right now, so not something I can just ignore. Not sure if this is something, that other people are experiencing, but I hope, somebody has an idea how to fix it. Until then, I'll roll back to 13.2 .   What I've tried so far and did not work: Reinstall Optimize cataloge Export Presets, delete them in lightroom and re-import them Create a new cataloge Cleanse the Cache     Here are my System Infos (Minus Personal Info):   Lightroom Classic version: 13.3 [ 202405092057-40441e28 ] License: Creative Cloud Language setting: en Operating system: Windows 10 - Business Edition Version: 10.0.19045 Application architecture: x64 System architecture: x64 Logical processor count: 12 Processor speed: 3,6GHz SqLite Version: 3.36.0 CPU Utilisation: 1,0% Power Source: Plugged In, 255% Built-in memory: 32692,9 MB Dedicated GPU memory used by Lightroom: 5815,3MB / 12011,0MB (48%) Real memory available to Lightroom: 32692,9 MB Real memory used by Lightroom: 6854,8 MB (20,9%) Virtual memory used by Lightroom: 14316,0 MB GDI objects count: 1181 USER objects count: 4091 Process handles count: 3036 Memory cache size: 3255,4MB Internal Camera Raw version: 16.3 [ 1863 ] Maximum thread count used by Camera Raw: 5 Camera Raw SIMD optimization: SSE2,AVX,AVX2 Camera Raw virtual memory: 1759MB / 16346MB (10%) Camera Raw real memory: 2030MB / 32692MB (6%) <deleted> ... View more

I have observed an annoying bug, or maybe I should rather call it an annoying way Lightroom Classic CC seems to handle System Memory (DDR), and was wondering, if anybody has a similar issue or a workaround.   My issue is the following: Every time, I use a function in lightroom for the first time in a session (so every first time after opening the program and starting to work on pictures, not first time ever) Lightrooms DDR demand is increased, resulting in Lightroom constantly loading new data into the system memory. Thats fine, BUT Lightroom never seems to purge the Data from the DDR, even after an operation is done and no longer requires active resources. This leads to annoying slow downs. I've seen this behaviour on both my Windows desktop (Ryzen 5600x, 32GB DDR4 3200 RAM, RTX2070, 2x 1TB NVME Samsung 980) as well as my MacBook Pro (14inch, M1 Pro, 16gb Ram)     Let me give you an example how this looks on my Windows machine: I open up Lightroom and navigate to the Develop Module. RAM usage at this point sits an around 2,4 GB.   Now I start editing a couple of Photos. Ram usage immediately shoots up to around 6.1 GB and stays there, even after around 20 edits of 33 mp photos.   Next up, I want to merge photos into a panorama or use the "enhance detail" function, mainly to improve drone shots from my mini 3 pro. (so 12 mp raws). After having done bot, the RAM usage now sits at almost 13GB.Also Lightroom noticeably slows down, even though there is more then enough RAM left, both physical and virtual. The weird part to me is, that unless you restart lightroom, that RAM usage never ever goes back down again. Even though my Panorama is finished, my Photo is enhanced and i'm back in the library trying to sort my photos. I don't get, why Lightroom need to keep Data in the System Memory, that is, based upon usage during normal edits, not needed in order for it to work just fine. I've optimized my catalouge, tried a different or new catalogue and reinstalled lightroom, all to no avail.   My RAW Cache sits on a state of the art PCI Express NVME and is set to 50GB, I disabled Video Cache and like I said, I've seen this on both my Windows as well as my Mac.   So, bottom line: My current workaround is, to restart Lightroom every time the memory fill-up is starting to cause issues (especially after every panorama or enhance detail) but that can't be the indented behaviour of Lightroom Classic. So, does anybody have an Idea what the cause of this could be or whether it's being fixed with a future update?                 ... View more