Hope I can get some advice on the best way to configure Photoshop to work with super large (20GB-30GB and larger) files. When Photoshop—running on my honking big Windows PC—tries to swallow those honking big 16-bit files, brush strokes lag, and commands are not executed with reasonable speed. Some things to note: 1) I’m aware of strategies for working with smaller files that can feed into the base file. However, when working in the complete base file, it is possible to manipulate any of the other layers to gauge how those manipulations affect my work on the current layer. That’s critical when I’m trying to blend the content of the current layer into the total image. Can’t do that when working with smaller feeder files. 2) I have the horsepower (a Dell Precision 7820 Tower Workstation with a Xeon Gold processor, 96GB of the fastest RAM [at that time]; an Nvidia Quadro RTX5000, 16GB video card, a Class 50 1TB SSD for the operating system and an internal 960GB Optane Drive for use as a scratch drive, etc., etc.) My guess is that I don’t have a complete understanding of the extent to which PS can actually use that computing power. 3) While PS is bogged down with those files, my efficiency is still 100% with several hundred GBs still free on my scratch disks. (The dedicated internal 960 GB Optane Drive is my primary scratch disk.) 4) I have my preferences set to allow PS to access 85% of that 96GB of RAM. My understanding is that 64-bit Photoshop can use as much RAM as I can allocate, which comes out to 65+GB of available RAM, which should easily handle a 20GB-30GB file. My understanding is that, e.g., 50 history states would require 1000GB on a scratch disk for a 20GB working file. By limiting to 1 history state, I have seen some improvement in performance. But that’s “unworkable” improved to “marginal.” 5) My Performance settings are as follows: Mem Usage 85% (65023 MB), Use Graphics Processor/Open CL, Huge Pixel Dimensions, Cache Levels: 8, Cache Tile Size 1024K, Multithreaded compositing. My scratch disks include (1) D:\ dedicated internal SSD Optane Drive w/830GB of free space, (2) C:\ internal Class 50 system SSD w/701GB of free space, (3) O:\ an external SSD with 837GB of free space. If anyone has any experience working with super large files and can offer any advice, I’d love to hear from you. Thanks.
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